/**** 
* Classes
****/ 
// Define the 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 = -10;
	self.update = function () {
		self.y += self.speed;
		if (self.y < -self.height) {
			self.destroy();
		}
	};
});
// Define the 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 = 3;
	self.update = function () {
		self.y += self.speed;
		if (self.y > 2732) {
			self.y = -self.height;
		}
	};
});
//<Assets used in the game will automatically appear here>
// Define the 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 = 5;
	self.update = function () {
		// Player update logic
	};
	self.move = function (x, y) {
		self.x = x;
		self.y = y;
	};
});

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

/**** 
* Game Code
****/ 
// Add city road background
var cityRoadBg = LK.getAsset('cityroad', {
	anchorX: 0.5,
	anchorY: 0,
	x: 2048 / 2,
	y: 0,
	width: 2048,
	height: 2732
});
game.addChild(cityRoadBg);
// Initialize player
var player = game.addChild(new Player());
player.x = 2048 / 2;
player.y = 2732 - 200;
// Initialize enemies
var enemies = [];
for (var i = 0; i < 5; i++) {
	var enemy = game.addChild(new Enemy());
	enemy.x = Math.random() * 2048;
	enemy.y = Math.random() * -2732;
	enemies.push(enemy);
}
// Initialize bullets
var bullets = [];
// Handle player movement
game.move = function (x, y, obj) {
	player.move(x, y);
};
// Handle shooting
game.down = function (x, y, obj) {
	var bullet = game.addChild(new Bullet());
	bullet.x = player.x;
	bullet.y = player.y;
	bullets.push(bullet);
};
// Update game state
game.update = function () {
	// Update player
	player.update();
	// Update enemies
	for (var i = 0; i < enemies.length; i++) {
		enemies[i].update();
	}
	// Update bullets
	for (var j = 0; j < bullets.length; j++) {
		bullets[j].update();
	}
	// Check for collisions
	for (var k = 0; k < bullets.length; k++) {
		for (var l = 0; l < enemies.length; l++) {
			if (bullets[k].intersects(enemies[l])) {
				bullets[k].destroy();
				enemies[l].destroy();
				bullets.splice(k, 1);
				enemies.splice(l, 1);
				// Spawn a new enemy at a random position at the top
				var newEnemy = game.addChild(new Enemy());
				newEnemy.x = Math.random() * 2048;
				newEnemy.y = Math.random() * -500; // spawn slightly above the screen
				enemies.push(newEnemy);
				break;
			}
		}
	}
};

===================================================================
--- original.js
+++ change.js
@@ -58,8 +58,18 @@
 
 /**** 
 * Game Code
 ****/ 
+// Add city road background
+var cityRoadBg = LK.getAsset('cityroad', {
+	anchorX: 0.5,
+	anchorY: 0,
+	x: 2048 / 2,
+	y: 0,
+	width: 2048,
+	height: 2732
+});
+game.addChild(cityRoadBg);
 // Initialize player
 var player = game.addChild(new Player());
 player.x = 2048 / 2;
 player.y = 2732 - 200;