/**** 
* Classes
****/ 
// Define a Bullet class
var Bullet = Container.expand(function () {
	var self = Container.call(this);
	var bulletGraphics = self.attachAsset('bullet', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.speed = -15;
	self.update = function () {
		self.y += self.speed;
		if (self.y < 0) {
			self.destroy();
		}
	};
});
// Define an Enemy class
var Enemy = Container.expand(function () {
	var self = Container.call(this);
	var enemyGraphics = self.attachAsset('enemy', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.speed = 5;
	self.update = function () {
		self.y += self.speed;
		if (self.y > 2732) {
			self.y = 0;
			self.x = Math.random() * 2048;
		}
	};
});
// Assets will be automatically created and loaded by the LK engine based on their usage in the code.
// Define a Player class
var Player = Container.expand(function () {
	var self = Container.call(this);
	var playerGraphics = self.attachAsset('player', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.speed = 10;
	self.update = function () {
		// Player update logic
	};
});

/**** 
* Initialize Game
****/ 
var game = new LK.Game({
	backgroundColor: 0x000000 // Init game with black background
});

/**** 
* Game Code
****/ 
// Initialize background
var background = game.addChild(LK.getAsset('background', {
	anchorX: 0.0,
	anchorY: 0.0,
	x: 0,
	y: 0
}));
// Initialize player
var player = game.addChild(new Player());
player.x = 2048 / 2;
player.y = 2732 - 150;
// Initialize enemies
var enemies = [];
for (var i = 0; i < 10; i++) {
	var enemy = new Enemy();
	enemy.x = Math.random() * 2048;
	enemy.y = Math.random() * 1000;
	enemies.push(enemy);
	game.addChild(enemy);
}
// Initialize bullets
var bullets = [];
// Handle player movement
game.move = function (x, y, obj) {
	player.x = x;
	player.y = y;
};
// Handle shooting
game.down = function (x, y, obj) {
	var bullet = new Bullet();
	bullet.x = player.x;
	bullet.y = player.y;
	bullets.push(bullet);
	game.addChild(bullet);
};
// Game update loop
game.update = function () {
	// Update enemies
	for (var i = 0; i < enemies.length; i++) {
		enemies[i].update();
	}
	// Update bullets
	for (var j = bullets.length - 1; j >= 0; j--) {
		bullets[j].update();
		// Check for bullet collision with enemies
		for (var k = enemies.length - 1; k >= 0; k--) {
			if (bullets[j].intersects(enemies[k])) {
				bullets[j].destroy();
				bullets.splice(j, 1);
				enemies[k].destroy();
				enemies.splice(k, 1);
				break;
			}
		}
	}
	// Check for game over condition
	for (var l = 0; l < enemies.length; l++) {
		if (player.intersects(enemies[l])) {
			LK.effects.flashScreen(0xff0000, 1000);
			LK.showGameOver();
			break;
		}
	}
};

===================================================================
--- original.js
+++ change.js
@@ -5,11 +5,9 @@
 var Bullet = Container.expand(function () {
 	var self = Container.call(this);
 	var bulletGraphics = self.attachAsset('bullet', {
 		anchorX: 0.5,
-		anchorY: 0.5,
-		scaleX: 2,
-		scaleY: 2
+		anchorY: 0.5
 	});
 	self.speed = -15;
 	self.update = function () {
 		self.y += self.speed;
@@ -57,8 +55,15 @@
 
 /**** 
 * Game Code
 ****/ 
+// Initialize background
+var background = game.addChild(LK.getAsset('background', {
+	anchorX: 0.0,
+	anchorY: 0.0,
+	x: 0,
+	y: 0
+}));
 // Initialize player
 var player = game.addChild(new Player());
 player.x = 2048 / 2;
 player.y = 2732 - 150;