/**** 
* Classes
****/ 
// 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;
	};
});
// 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;
	};
});
//<Assets used in the game will automatically appear here>
// Hero class
var Hero = Container.expand(function () {
	var self = Container.call(this);
	var heroGraphics = self.attachAsset('hero', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.speed = 10;
	self.update = function () {
		// Hero update logic
	};
});
// RobotDog class
var RobotDog = Container.expand(function () {
	var self = Container.call(this);
	var robotDogGraphics = self.attachAsset('robotDog', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.speed = 10;
	self.direction = 1;
	self.update = function () {
		self.y += self.speed;
		self.x += self.direction * 5;
		if (self.x > 2048 - 75 || self.x < 75) {
			self.direction *= -1;
		}
	};
});

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

/**** 
* Game Code
****/ 
// Initialize hero
var hero = game.addChild(new Hero());
hero.x = 2048 / 2;
hero.y = 2732 - 200;
// Initialize arrays for bullets and enemies
var bullets = [];
var enemies = [];
var robotDogs = [];
// Score display
var scoreTxt = new Text2('0', {
	size: 150,
	fill: "#ffffff"
});
scoreTxt.anchor.set(0.5, 0);
LK.gui.top.addChild(scoreTxt);
// Handle move events
function handleMove(x, y, obj) {
	hero.x = x;
	hero.y = y;
}
game.move = handleMove;
// Handle shooting
game.down = function (x, y, obj) {
	var newBullet = new Bullet();
	newBullet.x = hero.x;
	newBullet.y = hero.y;
	bullets.push(newBullet);
	game.addChild(newBullet);
};
// Update game state
game.update = function () {
	// Update bullets
	for (var i = bullets.length - 1; i >= 0; i--) {
		bullets[i].update();
		if (bullets[i].y < -50) {
			bullets[i].destroy();
			bullets.splice(i, 1);
		}
	}
	// Update enemies
	for (var j = enemies.length - 1; j >= 0; j--) {
		enemies[j].update();
		if (enemies[j].y > 2732 + 50) {
			enemies[j].destroy();
			enemies.splice(j, 1);
		}
	}
	// Update robotDogs
	for (var m = robotDogs.length - 1; m >= 0; m--) {
		robotDogs[m].update();
		if (robotDogs[m].y > 2732 + 50) {
			robotDogs[m].destroy();
			robotDogs.splice(m, 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);
				LK.setScore(LK.getScore() + 1);
				scoreTxt.setText(LK.getScore());
				break;
			}
		}
		for (var n = robotDogs.length - 1; n >= 0; n--) {
			if (bullets[k] && bullets[k].intersects(robotDogs[n])) {
				bullets[k].destroy();
				robotDogs[n].destroy();
				bullets.splice(k, 1);
				robotDogs.splice(n, 1);
				LK.setScore(LK.getScore() + 2);
				scoreTxt.setText(LK.getScore());
				break;
			}
		}
	}
	// Spawn enemies
	if (LK.ticks % 60 == 0) {
		var newEnemy = new Enemy();
		newEnemy.x = Math.random() * 2048;
		newEnemy.y = -50;
		enemies.push(newEnemy);
		game.addChild(newEnemy);
	}
	// Spawn robotDogs
	if (LK.ticks % 120 == 0) {
		var newRobotDog = new RobotDog();
		newRobotDog.x = Math.random() * 2048;
		newRobotDog.y = -50;
		robotDogs.push(newRobotDog);
		game.addChild(newRobotDog);
	}
};

===================================================================
--- original.js
+++ change.js
@@ -44,11 +44,16 @@
 	var robotDogGraphics = self.attachAsset('robotDog', {
 		anchorX: 0.5,
 		anchorY: 0.5
 	});
-	self.speed = 7;
+	self.speed = 10;
+	self.direction = 1;
 	self.update = function () {
 		self.y += self.speed;
+		self.x += self.direction * 5;
+		if (self.x > 2048 - 75 || self.x < 75) {
+			self.direction *= -1;
+		}
 	};
 });
 
 /****