/**** 
* Classes
****/ 
// Define a class for bullets
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 < 0) {
			self.destroy();
		}
	};
});
// Define a class for enemies
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.update = function () {
		self.y += self.speed;
		if (self.y > 2732) {
			self.y = 0;
			self.x = Math.random() * 2048;
		}
	};
});
// Define a class for plants
var Plant = Container.expand(function () {
	var self = Container.call(this);
	self.update = function () {
		// Update logic for plants
	};
});
//<Assets used in the game will automatically appear here>
//<Write imports for supported plugins here>
// Define a class for the player character
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 () {
		// Update logic for player
	};
});

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

/**** 
* Game Code
****/ 
// Initialize player
var player;
// Initialize plants
var plants = [];
// Initialize enemies
var enemies = [];
// Initialize bullets
var bullets = [];
// Add context menu to start the game
document.addEventListener('contextmenu', function (e) {
	e.preventDefault();
	// Initialize player
	player = game.addChild(new Player());
	player.x = 1024;
	player.y = 2500;
	// Initialize plants
	for (var i = 0; i < 5; i++) {
		var plant = new Plant();
		plant.x = Math.random() * 2048;
		plant.y = Math.random() * 2732;
		plants.push(plant);
		game.addChild(plant);
	}
	// Initialize enemies
	for (var i = 0; i < 5; i++) {
		var enemy = new Enemy();
		enemy.x = Math.random() * 2048;
		enemy.y = Math.random() * 1000;
		enemies.push(enemy);
		game.addChild(enemy);
	}
}, false);
// Handle player movement
game.move = function (x, y, obj) {
	if (player) {
		player.x = x;
		player.y = y;
	}
};
// Handle shooting
game.down = function (x, y, obj) {
	if (player) {
		var bullet = new Bullet();
		bullet.x = player.x;
		bullet.y = player.y;
		bullets.push(bullet);
		game.addChild(bullet);
	}
};
// Update game state
game.update = function () {
	// Update player
	if (player) {
		player.update();
	}
	// 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();
		if (bullets[j].y < 0) {
			bullets.splice(j, 1);
		}
	}
	// Check for collisions
	for (var k = bullets.length - 1; k >= 0; k--) {
		for (var l = enemies.length - 1; l >= 0; 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
@@ -64,48 +64,62 @@
 /**** 
 * Game Code
 ****/ 
 // Initialize player
-var player = game.addChild(new Player());
-player.x = 1024;
-player.y = 2500;
+var player;
 // Initialize plants
 var plants = [];
-for (var i = 0; i < 5; i++) {
-	var plant = new Plant();
-	plant.x = Math.random() * 2048;
-	plant.y = Math.random() * 2732;
-	plants.push(plant);
-	game.addChild(plant);
-}
 // Initialize enemies
 var enemies = [];
-for (var i = 0; i < 5; 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 = [];
+// Add context menu to start the game
+document.addEventListener('contextmenu', function (e) {
+	e.preventDefault();
+	// Initialize player
+	player = game.addChild(new Player());
+	player.x = 1024;
+	player.y = 2500;
+	// Initialize plants
+	for (var i = 0; i < 5; i++) {
+		var plant = new Plant();
+		plant.x = Math.random() * 2048;
+		plant.y = Math.random() * 2732;
+		plants.push(plant);
+		game.addChild(plant);
+	}
+	// Initialize enemies
+	for (var i = 0; i < 5; i++) {
+		var enemy = new Enemy();
+		enemy.x = Math.random() * 2048;
+		enemy.y = Math.random() * 1000;
+		enemies.push(enemy);
+		game.addChild(enemy);
+	}
+}, false);
 // Handle player movement
 game.move = function (x, y, obj) {
-	player.x = x;
-	player.y = y;
+	if (player) {
+		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);
+	if (player) {
+		var bullet = new Bullet();
+		bullet.x = player.x;
+		bullet.y = player.y;
+		bullets.push(bullet);
+		game.addChild(bullet);
+	}
 };
 // Update game state
 game.update = function () {
 	// Update player
-	player.update();
+	if (player) {
+		player.update();
+	}
 	// Update enemies
 	for (var i = 0; i < enemies.length; i++) {
 		enemies[i].update();
 	}