===================================================================
--- original.js
+++ change.js
@@ -1,126 +1,114 @@
-/****
+/**** 
 * Classes
 ****/
 var Hero = Container.expand(function () {
-  var self = Container.call(this);
-  var heroGraphics = self.attachAsset('hero', {
-    anchorX: 0.5,
-    anchorY: 0.5
-  });
-  self.move = function (x, y) {
-    self.x = x;
-    self.y = y;
-  };
-  self.shoot = function () {
-    var bullet = new HeroBullet();
-    bullet.x = self.x;
-    bullet.y = self.y - self.height / 2;
-    game.addChild(bullet);
-    return bullet;
-  };
+	var self = Container.call(this);
+	var heroGraphics = self.attachAsset('hero', {
+		anchorX: 0.5,
+		anchorY: 0.5
+	});
+	self.move = function (x, y) {
+		self.x = x;
+		self.y = y;
+	};
+	self.shoot = function () {
+		var bullet = new HeroBullet();
+		bullet.x = self.x;
+		bullet.y = self.y - self.height / 2;
+		game.addChild(bullet);
+		return bullet;
+	};
 });
 var Enemy = Container.expand(function () {
-  var self = Container.call(this);
-  var enemyGraphics = self.attachAsset('enemy', {
-    anchorX: 0.5,
-    anchorY: 0.5
-  });
-  self.speed = 2;
-  self.move = function () {
-    self.y += self.speed;
-  };
+	var self = Container.call(this);
+	var enemyGraphics = self.attachAsset('enemy', {
+		anchorX: 0.5,
+		anchorY: 0.5
+	});
+	self.speed = 2;
+	self.move = function () {
+		self.y += self.speed;
+	};
 });
 var HeroBullet = Container.expand(function () {
-  var self = Container.call(this);
-  var bulletGraphics = self.attachAsset('heroBullet', {
-    anchorX: 0.5,
-    anchorY: 0.5
-  });
-  self.speed = -5;
-  self.move = function () {
-    self.y += self.speed;
-  };
+	var self = Container.call(this);
+	var bulletGraphics = self.attachAsset('heroBullet', {
+		anchorX: 0.5,
+		anchorY: 0.5
+	});
+	self.speed = -5;
+	self.move = function () {
+		self.y += self.speed;
+	};
 });
-var EnemyBullet = Container.expand(function () {
-  var self = Container.call(this);
-  var bulletGraphics = self.attachAsset('enemyBullet', {
-    anchorX: 0.5,
-    anchorY: 0.5
-  });
-  self.speed = 5;
-  self.move = function () {
-    self.y += self.speed;
-  };
-});
 
-/****
+/**** 
 * Initialize Game
 ****/
 var game = new LK.Game({
-  backgroundColor: 0x000000 // Init game with black background
+	backgroundColor: 0x000000 // Init game with black background
 });
 
-/****
+/**** 
 * Game Code
 ****/
 var hero = game.addChild(new Hero());
 hero.x = 2048 / 2;
 hero.y = 2732 - 100;
 var enemies = [];
 var heroBullets = [];
-var enemyBullets = [];
 var score = 0;
 var scoreTxt = new Text2(score.toString(), {
-  size: 150,
-  fill: "#ffffff"
+	size: 150,
+	fill: "#ffffff"
 });
 scoreTxt.anchor.set(0.5, 0);
 LK.gui.top.addChild(scoreTxt);
 game.on('down', function (obj) {
-  var pos = obj.event.getLocalPosition(game);
-  hero.move(pos.x, pos.y);
+	var pos = obj.event.getLocalPosition(game);
+	hero.move(pos.x, pos.y);
 });
 LK.on('tick', function () {
-  // Move hero bullets
-  for (var i = heroBullets.length - 1; i >= 0; i--) {
-    heroBullets[i].move();
-    if (heroBullets[i].y < 0) {
-      heroBullets[i].destroy();
-      heroBullets.splice(i, 1);
-    }
-  }
-  // Move enemies
-  for (var j = enemies.length - 1; j >= 0; j--) {
-    enemies[j].move();
-    if (enemies[j].y > 2732) {
-      enemies[j].destroy();
-      enemies.splice(j, 1);
-    }
-  }
-  // Check for collisions
-  for (var k = heroBullets.length - 1; k >= 0; k--) {
-    for (var l = enemies.length - 1; l >= 0; l--) {
-      if (heroBullets[k].intersects(enemies[l])) {
-        heroBullets[k].destroy();
-        heroBullets.splice(k, 1);
-        enemies[l].destroy();
-        enemies.splice(l, 1);
-        score += 10;
-        scoreTxt.setText(score.toString());
-        break;
-      }
-    }
-  }
-  // Spawn enemies
-  if (LK.ticks % 120 == 0) {
-    var enemy = new Enemy();
-    enemy.x = Math.random() * (2048 - enemy.width) + enemy.width / 2;
-    enemy.y = -enemy.height / 2;
-    enemies.push(enemy);
-    game.addChild(enemy);
-  }
-  // Hero shoot
-  if (LK.ticks % 30 == 0) {
-    heroBullets.push(hero.shoot());
-  }
+	// Move hero bullets
+	for (var i = heroBullets.length - 1; i >= 0; i--) {
+		heroBullets[i].move();
+		if (heroBullets[i].y < 0) {
+			heroBullets[i].destroy();
+			heroBullets.splice(i, 1);
+		}
+	}
+	// Move enemies
+	for (var j = enemies.length - 1; j >= 0; j--) {
+		enemies[j].move();
+		if (enemies[j].y > 2732) {
+			enemies[j].destroy();
+			enemies.splice(j, 1);
+		}
+	}
+	// Check for collisions
+	for (var k = heroBullets.length - 1; k >= 0; k--) {
+		for (var l = enemies.length - 1; l >= 0; l--) {
+			if (heroBullets[k].intersects(enemies[l])) {
+				heroBullets[k].destroy();
+				heroBullets.splice(k, 1);
+				enemies[l].destroy();
+				enemies.splice(l, 1);
+				score += 10;
+				scoreTxt.setText(score.toString());
+				break;
+			}
+		}
+	}
+	// Spawn enemies
+	if (LK.ticks % 120 == 0) {
+		var enemy = new Enemy();
+		enemy.x = Math.random() * (2048 - enemy.width) + enemy.width / 2;
+		enemy.y = -enemy.height / 2;
+		enemies.push(enemy);
+		game.addChild(enemy);
+	}
+	// Hero shoot
+	if (LK.ticks % 30 == 0) {
+		heroBullets.push(hero.shoot());
+	}
 });
\ No newline at end of file