/**** 
* Classes
****/ 
// Define a simple 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 a simple 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;
		}
	};
});
// Define a simple 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
	};
});

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

/**** 
* Game Code
****/ 
// Initialize player
var player = new Player();
player.x = 2048 / 2;
player.y = 2732 - 200;
game.addChild(player);
// Initialize enemies array
var enemies = [];
for (var i = 0; i < 5; i++) {
	var enemy = new Enemy();
	enemy.x = Math.random() * 2048;
	enemy.y = Math.random() * -2732;
	enemies.push(enemy);
	game.addChild(enemy);
}
// Initialize bullets array
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);
};
// Update game logic
game.update = function () {
	// Update player
	player.update();
	// Update enemies
	for (var i = 0; i < enemies.length; i++) {
		enemies[i].update();
	}
	// Create enemies every 1 second
	if (LK.ticks % 60 == 0) {
		var enemy = new Enemy();
		enemy.x = Math.random() * 2048;
		enemy.y = Math.random() * -2732;
		enemies.push(enemy);
		game.addChild(enemy);
	}
	// 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);
				break;
			}
		}
	}
};

===================================================================
--- original.js
+++ change.js
@@ -90,8 +90,16 @@
 	// Update enemies
 	for (var i = 0; i < enemies.length; i++) {
 		enemies[i].update();
 	}
+	// Create enemies every 1 second
+	if (LK.ticks % 60 == 0) {
+		var enemy = new Enemy();
+		enemy.x = Math.random() * 2048;
+		enemy.y = Math.random() * -2732;
+		enemies.push(enemy);
+		game.addChild(enemy);
+	}
 	// Update bullets
 	for (var j = 0; j < bullets.length; j++) {
 		bullets[j].update();
 	}