diff --git a/assets/Level.fire b/assets/Level.fire
new file mode 100644
index 0000000..0d7bdc0
--- /dev/null
+++ b/assets/Level.fire
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+      "__uuid__": "f0048c10-f03e-4c97-b9d3-3506e1d58952"
+    },
+    "_N$disabledSprite": {
+      "__uuid__": "29158224-f8dd-4661-a796-1ffab537140e"
+    },
+    "_N$target": {
+      "__id__": 28
+    },
+    "_id": "07Xool7WZN8ovK0H1mRfer"
+  },
+  {
+    "__type__": "cc.Canvas",
+    "_name": "",
+    "_objFlags": 0,
+    "node": {
+      "__id__": 2
+    },
+    "_enabled": true,
+    "_designResolution": {
+      "__type__": "cc.Size",
+      "width": 960,
+      "height": 640
+    },
+    "_fitWidth": true,
+    "_fitHeight": true,
+    "_id": "e2gz2maPBOAJm7f/2s7v8j"
+  },
+  {
+    "__type__": "19aaeSYSZZGULvtl5gcIKyn",
+    "_name": "",
+    "_objFlags": 0,
+    "node": {
+      "__id__": 2
+    },
+    "_enabled": true,
+    "protonSM": {
+      "__uuid__": "59b8f7eb-f327-47e0-aa01-42ecad377557"
+    },
+    "protonMD": {
+      "__uuid__": "75af4f59-790b-4c40-ba2e-54ffc1cc3c23"
+    },
+    "protonLG": {
+      "__uuid__": "9c3d7d56-f77a-4e1f-a64c-865e00c80cff"
+    },
+    "_id": "8dK9bnJ2JCt4TbPD5ysSKm"
+  }
+]
\ No newline at end of file
diff --git a/assets/Level.fire.meta b/assets/Level.fire.meta
new file mode 100644
index 0000000..a70d5a5
--- /dev/null
+++ b/assets/Level.fire.meta
@@ -0,0 +1,7 @@
+{
+  "ver": "1.2.1",
+  "uuid": "3eba991d-703c-4c11-ac81-b6548a4722ec",
+  "asyncLoadAssets": false,
+  "autoReleaseAssets": false,
+  "subMetas": {}
+}
\ No newline at end of file
diff --git a/assets/Menu.fire b/assets/Menu.fire
index 6460c9a..b467a94 100644
--- a/assets/Menu.fire
+++ b/assets/Menu.fire
@@ -69,10 +69,10 @@
     "_level": 1,
     "_components": [
       {
-        "__id__": 8
+        "__id__": 14
       },
       {
-        "__id__": 9
+        "__id__": 15
       }
     ],
     "_prefab": null,
@@ -156,7 +156,7 @@
       "__type__": "cc.Vec3",
       "x": 0,
       "y": 0,
-      "z": 876.417708629852
+      "z": 780.2888888097792
     },
     "_scale": {
       "__type__": "cc.Vec3",
@@ -213,20 +213,24 @@
   },
   {
     "__type__": "cc.Node",
-    "_name": "play",
+    "_name": "button",
     "_objFlags": 0,
     "_parent": {
       "__id__": 2
     },
-    "_children": [],
+    "_children": [
+      {
+        "__id__": 6
+      }
+    ],
     "_active": true,
     "_level": 2,
     "_components": [
       {
-        "__id__": 6
+        "__id__": 11
       },
       {
-        "__id__": 7
+        "__id__": 13
       }
     ],
     "_prefab": null,
@@ -241,7 +245,7 @@
     "_contentSize": {
       "__type__": "cc.Size",
       "width": 416,
-      "height": 108
+      "height": 148
     },
     "_anchorPoint": {
       "__type__": "cc.Vec2",
@@ -257,7 +261,7 @@
     "_scale": {
       "__type__": "cc.Vec3",
       "x": 1,
-      "y": 0.66,
+      "y": 0.44445,
       "z": 1
     },
     "_eulerAngles": {
@@ -270,14 +274,169 @@
     "_skewY": 0,
     "_is3DNode": false,
     "groupIndex": 0,
-    "_id": "9c/kR6zopOCq2Elgf3X+l+"
+    "_id": "69HYmEC4hC1aoSBRgg0FAJ"
+  },
+  {
+    "__type__": "cc.Node",
+    "_name": "Background",
+    "_objFlags": 0,
+    "_parent": {
+      "__id__": 5
+    },
+    "_children": [
+      {
+        "__id__": 7
+      }
+    ],
+    "_active": true,
+    "_level": 2,
+    "_components": [
+      {
+        "__id__": 9
+      },
+      {
+        "__id__": 10
+      }
+    ],
+    "_prefab": null,
+    "_opacity": 255,
+    "_color": {
+      "__type__": "cc.Color",
+      "r": 26,
+      "g": 26,
+      "b": 26,
+      "a": 255
+    },
+    "_contentSize": {
+      "__type__": "cc.Size",
+      "width": 416,
+      "height": 148
+    },
+    "_anchorPoint": {
+      "__type__": "cc.Vec2",
+      "x": 0.5,
+      "y": 0.5
+    },
+    "_position": {
+      "__type__": "cc.Vec3",
+      "x": 0,
+      "y": 0,
+      "z": 0
+    },
+    "_scale": {
+      "__type__": "cc.Vec3",
+      "x": 1,
+      "y": 1,
+      "z": 1
+    },
+    "_eulerAngles": {
+      "__type__": "cc.Vec3",
+      "x": 0,
+      "y": 0,
+      "z": 0
+    },
+    "_skewX": 0,
+    "_skewY": 0,
+    "_is3DNode": false,
+    "groupIndex": 0,
+    "_id": "a3huG/zeRBTLCQROSq3ztB"
+  },
+  {
+    "__type__": "cc.Node",
+    "_name": "Label",
+    "_objFlags": 0,
+    "_parent": {
+      "__id__": 6
+    },
+    "_children": [],
+    "_active": true,
+    "_level": 3,
+    "_components": [
+      {
+        "__id__": 8
+      }
+    ],
+    "_prefab": null,
+    "_opacity": 255,
+    "_color": {
+      "__type__": "cc.Color",
+      "r": 255,
+      "g": 255,
+      "b": 255,
+      "a": 255
+    },
+    "_contentSize": {
+      "__type__": "cc.Size",
+      "width": 200,
+      "height": 100
+    },
+    "_anchorPoint": {
+      "__type__": "cc.Vec2",
+      "x": 0.5,
+      "y": 0.5
+    },
+    "_position": {
+      "__type__": "cc.Vec3",
+      "x": 0,
+      "y": 0,
+      "z": 0
+    },
+    "_scale": {
+      "__type__": "cc.Vec3",
+      "x": 1,
+      "y": 1,
+      "z": 1
+    },
+    "_eulerAngles": {
+      "__type__": "cc.Vec3",
+      "x": 0,
+      "y": 0,
+      "z": 0
+    },
+    "_skewX": 0,
+    "_skewY": 0,
+    "_is3DNode": false,
+    "groupIndex": 0,
+    "_id": "f7ZK1FmCpCZ5ivVxgV+zW0"
+  },
+  {
+    "__type__": "cc.Label",
+    "_name": "",
+    "_objFlags": 0,
+    "node": {
+      "__id__": 7
+    },
+    "_enabled": true,
+    "_materials": [
+      {
+        "__uuid__": "eca5d2f2-8ef6-41c2-bbe6-f9c79d09c432"
+      }
+    ],
+    "_useOriginalSize": false,
+    "_string": "START",
+    "_N$string": "START",
+    "_fontSize": 50,
+    "_lineHeight": 40,
+    "_enableWrapText": false,
+    "_N$file": null,
+    "_isSystemFontUsed": true,
+    "_isUseVerticalKerning": true,
+    "_verticalKerning": null,
+    "_spacingX": 0,
+    "_batchAsBitmap": false,
+    "_N$horizontalAlign": 1,
+    "_N$verticalAlign": 1,
+    "_N$fontFamily": "Arial",
+    "_N$overflow": 1,
+    "_N$cacheMode": 0,
+    "_id": "e35+dINdxC/49nsWhSHhH3"
   },
   {
     "__type__": "cc.Sprite",
     "_name": "",
     "_objFlags": 0,
     "node": {
-      "__id__": 5
+      "__id__": 6
     },
     "_enabled": true,
     "_materials": [
@@ -288,10 +447,10 @@
     "_srcBlendFactor": 770,
     "_dstBlendFactor": 771,
     "_spriteFrame": {
-      "__uuid__": "983fa58a-66aa-4526-a54d-dc95037f1259"
+      "__uuid__": "f0048c10-f03e-4c97-b9d3-3506e1d58952"
     },
-    "_type": 0,
-    "_sizeMode": 1,
+    "_type": 1,
+    "_sizeMode": 0,
     "_fillType": 0,
     "_fillCenter": {
       "__type__": "cc.Vec2",
@@ -302,7 +461,128 @@
     "_fillRange": 0,
     "_isTrimmedMode": true,
     "_atlas": null,
-    "_id": "3bA5w73CpHDrHFTBeG9DGv"
+    "_id": "6d7ZTBMFxAvrmL5zbdC4vz"
+  },
+  {
+    "__type__": "cc.Widget",
+    "_name": "",
+    "_objFlags": 0,
+    "node": {
+      "__id__": 6
+    },
+    "_enabled": true,
+    "alignMode": 0,
+    "_target": null,
+    "_alignFlags": 45,
+    "_left": 0,
+    "_right": 0,
+    "_top": 0,
+    "_bottom": 0,
+    "_verticalCenter": 0,
+    "_horizontalCenter": 0,
+    "_isAbsLeft": true,
+    "_isAbsRight": true,
+    "_isAbsTop": true,
+    "_isAbsBottom": true,
+    "_isAbsHorizontalCenter": true,
+    "_isAbsVerticalCenter": true,
+    "_originalWidth": 100,
+    "_originalHeight": 40,
+    "_id": "65HbE6twJMupjXdRg8qNia"
+  },
+  {
+    "__type__": "cc.Button",
+    "_name": "",
+    "_objFlags": 0,
+    "node": {
+      "__id__": 5
+    },
+    "_enabled": true,
+    "duration": 0.1,
+    "zoomScale": 1.2,
+    "clickEvents": [
+      {
+        "__id__": 12
+      }
+    ],
+    "_N$interactable": true,
+    "_N$enableAutoGrayEffect": false,
+    "_N$transition": 2,
+    "transition": 2,
+    "_N$normalColor": {
+      "__type__": "cc.Color",
+      "r": 230,
+      "g": 230,
+      "b": 230,
+      "a": 255
+    },
+    "_N$pressedColor": {
+      "__type__": "cc.Color",
+      "r": 200,
+      "g": 200,
+      "b": 200,
+      "a": 255
+    },
+    "pressedColor": {
+      "__type__": "cc.Color",
+      "r": 200,
+      "g": 200,
+      "b": 200,
+      "a": 255
+    },
+    "_N$hoverColor": {
+      "__type__": "cc.Color",
+      "r": 255,
+      "g": 255,
+      "b": 255,
+      "a": 255
+    },
+    "hoverColor": {
+      "__type__": "cc.Color",
+      "r": 255,
+      "g": 255,
+      "b": 255,
+      "a": 255
+    },
+    "_N$disabledColor": {
+      "__type__": "cc.Color",
+      "r": 120,
+      "g": 120,
+      "b": 120,
+      "a": 200
+    },
+    "_N$normalSprite": {
+      "__uuid__": "f0048c10-f03e-4c97-b9d3-3506e1d58952"
+    },
+    "_N$pressedSprite": {
+      "__uuid__": "e9ec654c-97a2-4787-9325-e6a10375219a"
+    },
+    "pressedSprite": {
+      "__uuid__": "e9ec654c-97a2-4787-9325-e6a10375219a"
+    },
+    "_N$hoverSprite": {
+      "__uuid__": "f0048c10-f03e-4c97-b9d3-3506e1d58952"
+    },
+    "hoverSprite": {
+      "__uuid__": "f0048c10-f03e-4c97-b9d3-3506e1d58952"
+    },
+    "_N$disabledSprite": {
+      "__uuid__": "29158224-f8dd-4661-a796-1ffab537140e"
+    },
+    "_N$target": {
+      "__id__": 6
+    },
+    "_id": "04Dqh37IRDyLnnoepjmU10"
+  },
+  {
+    "__type__": "cc.ClickEvent",
+    "target": {
+      "__id__": 5
+    },
+    "component": "",
+    "_componentId": "3a2abJhRaJFyrM9SBg5rWtB",
+    "handler": "loadLevelsScene",
+    "customEventData": ""
   },
   {
     "__type__": "3a2abJhRaJFyrM9SBg5rWtB",
@@ -312,9 +592,7 @@
       "__id__": 5
     },
     "_enabled": true,
-    "label": null,
-    "text": "hello",
-    "_id": "c9ABQ2655OSa44WE6gYPfI"
+    "_id": "b1l7jFcrZGValOGBcgRpBB"
   },
   {
     "__type__": "cc.Canvas",
diff --git a/assets/Scripts/EnemyShip.ts b/assets/Scripts/EnemyShip.ts
index 909d128..31f997b 100644
--- a/assets/Scripts/EnemyShip.ts
+++ b/assets/Scripts/EnemyShip.ts
@@ -13,8 +13,9 @@ const {ccclass, property} = cc._decorator;
 @ccclass
 export default class NewClass extends cc.Component {
 
-    duratrion : number = 15;
-    moveAmountY : number = 25;
+    duratrion : number = 2.5;
+    moveAmountX : number = 0;
+    RTL: boolean = false;
 
     moveEnemy : cc.ActionInterval;
 
@@ -26,8 +27,9 @@ export default class NewClass extends cc.Component {
     playAnimation : Boolean = true;
 
     setMovements() {
-        var moveDown = cc.moveBy(this.duratrion, cc.v2(0, -this.node.parent.getContentSize().height * 0.95));
-        this.node.runAction(cc.repeatForever(moveDown));
+        var moveLeft = cc.moveBy(this.duratrion, cc.v2(-this.moveAmountX, -this.node.parent.getContentSize().height * 0.32));
+        var moveRight = cc.moveBy(this.duratrion, cc.v2(this.moveAmountX, -this.node.parent.getContentSize().height * 0.32));
+        this.node.runAction(cc.repeatForever(this.RTL ? cc.sequence(moveRight, moveLeft) : cc.sequence(moveLeft, moveRight)));
     }
 
     shootBullets() {
diff --git a/assets/Scripts/Game.ts b/assets/Scripts/Game.ts
index e66deb0..8f57843 100644
--- a/assets/Scripts/Game.ts
+++ b/assets/Scripts/Game.ts
@@ -24,11 +24,32 @@ export default class NewClass extends cc.Component {
 
     spawnShips() {
         var ships = [this.alienship1, this.alienship2, this.alienship3];
-        var ship = cc.instantiate(ships[Math.floor(Math.random() * ships.length)]);
-        const shipX = Math.random() * 800 - 400;
+        var randomShip = Math.floor(Math.random() * ships.length);
+        var RTL = Math.random() < 0.5;
+        var shipPrefab = ships[randomShip];
+        
+        const batchMoveAmountX = Math.random() * 200 + 200;
+        
         const shipY = this.node.getContentSize().height * 0.95;
-        ship.setPosition(shipX, shipY);
-        this.node.addChild(ship);
+        
+        const screenHalfWidth = this.node.getContentSize().width / 2;
+        const shipMaxMove = batchMoveAmountX;
+        const margin = 0;
+        const shipXMin = -screenHalfWidth + shipMaxMove + margin;
+        const shipXMax = screenHalfWidth - shipMaxMove - margin;
+        const shipX = Math.random() * (shipXMax - shipXMin) + shipXMin;
+        
+        for (let i = 0; i < 12; i++) {
+            this.scheduleOnce(() => {
+                const ship = cc.instantiate(shipPrefab);
+                ship.setPosition(shipX, shipY);
+                this.node.addChild(ship);
+
+                const shipScript = ship.getComponent('EnemyShip');
+                shipScript.moveAmountX = batchMoveAmountX;
+                shipScript.RTL = RTL;
+            }, i * 0.5);
+        }
     }
 
     onLoad () {
@@ -37,8 +58,8 @@ export default class NewClass extends cc.Component {
     }
 
     start () {
-        this.schedule(this.spawnShips, 1, cc.macro.REPEAT_FOREVER, 1);
+        this.schedule(this.spawnShips, 5, cc.macro.REPEAT_FOREVER, 1);
     }
 
     // update (dt) {}
-}
+}
\ No newline at end of file
diff --git a/assets/Scripts/MenuBg.ts b/assets/Scripts/MenuBg.ts
index 4ac9a51..af39fb1 100644
--- a/assets/Scripts/MenuBg.ts
+++ b/assets/Scripts/MenuBg.ts
@@ -30,6 +30,7 @@ export default class NewClass extends cc.Component {
         const protonX = Math.random() * this.node.getContentSize().width - this.node.getContentSize().width / 2;
         const protonY = this.node.getContentSize().height;
         proton.setPosition(protonX, protonY);
+        proton.zIndex = -1;
         this.node.addChild(proton);
     }
 
diff --git a/assets/Scripts/SwitchScreens.ts b/assets/Scripts/SwitchScreens.ts
index 0412077..ea45a72 100644
--- a/assets/Scripts/SwitchScreens.ts
+++ b/assets/Scripts/SwitchScreens.ts
@@ -13,20 +13,15 @@ const {ccclass, property} = cc._decorator;
 @ccclass
 export default class NewClass extends cc.Component {
 
-    @property(cc.Label)
-    label: cc.Label = null;
+    loadLevelsScene() {
+        cc.director.preloadScene('Level', () => {
+            cc.director.loadScene('Level');
+        });
+    }
 
-    @property
-    text: string = 'hello';
-
-    // LIFE-CYCLE CALLBACKS:
-
-    // onLoad () {}
-
-    start () {
-        cc.director.preloadScene('Game');
-        this.node.on('touchstart', () => {
-            cc.director.loadScene('Game');
-        }, this);
+    loadGameScene(event, customData) {
+        cc.director.preloadScene('Level', () => {
+            cc.director.loadScene('Level');
+        });
     }
 }
diff --git a/assets/play.png b/assets/play.png
deleted file mode 100644
index 75302eb..0000000
Binary files a/assets/play.png and /dev/null differ
diff --git a/assets/play.png.meta b/assets/play.png.meta
deleted file mode 100644
index 2ad9eb7..0000000
--- a/assets/play.png.meta
+++ /dev/null
@@ -1,34 +0,0 @@
-{
-  "ver": "2.3.3",
-  "uuid": "2ca4193f-b750-49e3-afdd-d62a6855f675",
-  "type": "sprite",
-  "wrapMode": "clamp",
-  "filterMode": "bilinear",
-  "premultiplyAlpha": false,
-  "genMipmaps": false,
-  "packable": true,
-  "platformSettings": {},
-  "subMetas": {
-    "play": {
-      "ver": "1.0.4",
-      "uuid": "983fa58a-66aa-4526-a54d-dc95037f1259",
-      "rawTextureUuid": "2ca4193f-b750-49e3-afdd-d62a6855f675",
-      "trimType": "auto",
-      "trimThreshold": 1,
-      "rotated": false,
-      "offsetX": 0,
-      "offsetY": 0,
-      "trimX": 0,
-      "trimY": 0,
-      "width": 416,
-      "height": 108,
-      "rawWidth": 416,
-      "rawHeight": 108,
-      "borderTop": 0,
-      "borderBottom": 0,
-      "borderLeft": 0,
-      "borderRight": 0,
-      "subMetas": {}
-    }
-  }
-}
\ No newline at end of file