/**** 
* Classes
****/
var Dot = Container.expand(function () {
	var self = Container.call(this);
	var dotGraphics = self.attachAsset('dot', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.velocityY = 0;
	self.gravity = 0.5;
	self.bounce = -15;
	self.update = function () {
		var previousY = self.y;
		self.velocityY += self.gravity;
		self.y += self.velocityY;
		if (self.y > 2732 - self.height / 2) {
			self.velocityY = self.bounce;
		}
		self.movedDistance = self.y - previousY;
	};
	self.bounceUp = function () {
		self.velocityY = self.bounce;
	};
});
var Obstacle = Container.expand(function () {
	var self = Container.call(this);
	var obstacleGraphics = self.attachAsset('obstacle', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.direction = Math.random() < 0.5 ? -1 : 1;
	self.speed = (Math.random() * 3 + 5) * self.direction;
	self.move = function () {
		self.x += self.speed;
		if (self.direction === 1 && self.x > 2048 + self.width / 2 || self.direction === -1 && self.x < -self.width / 2) {
			self.direction *= -1;
			self.speed *= -1;
			self.y = Math.random() * (2732 - self.height) + self.height / 2;
		}
	};
	self.moveDown = function (distance) {
		self.y += distance;
		if (self.y > 2732 - self.height / 2) {
			self.y = -self.height / 2;
		}
	};
});
var Star = Container.expand(function () {
	var self = Container.call(this);
	var starGraphics = self.attachAsset('star', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.moveDown = function (distance) {
		self.y += distance;
		if (self.y > 2732 - self.height / 2) {
			self.y = -self.height / 2;
		}
	};
});

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

/**** 
* Game Code
****/
var stars = [];
var createStars = function createStars() {
	var lastStarY = stars.length > 0 ? stars[stars.length - 1].y : 0;
	if (2732 - lastStarY >= 2000) {
		var star = game.addChild(new Star());
		star.x = 2048 / 2;
		star.y = 2732 / 2;
		stars.push(star);
	}
};
var dot = game.addChild(new Dot());
dot.x = 2048 / 2;
dot.y = 2732 - dot.height / 2;
var obstacles = [];
for (var i = 0; i < 5; i++) {
	var obstacle = game.addChild(new Obstacle());
	obstacle.x = obstacle.direction === 1 ? -obstacle.width / 2 : 2048 + obstacle.width / 2;
	obstacle.y = Math.random() * (2732 - obstacle.height) + obstacle.height / 2;
	obstacles.push(obstacle);
}
var scoreTxt = new Text2('0', {
	size: 150,
	fill: "#ffffff"
});
scoreTxt.anchor.set(0.5, 0);
scoreTxt.x = 2048 / 2;
scoreTxt.y = 50;
LK.gui.top.addChild(scoreTxt);
game.on('down', function (obj) {
	dot.bounceUp();
});
LK.on('tick', function () {
	createStars();
	dot.update();
	for (var i = 0; i < obstacles.length; i++) {
		obstacles[i].move();
		if (dot.y < 1800 && dot.movedDistance < 0) {
			// If the dot moved up and its y position is less than 1800
			obstacles[i].moveDown(-dot.movedDistance);
			stars.forEach(function (star) {
				star.moveDown(-dot.movedDistance);
			});
		}
		if (dot.intersects(obstacles[i])) {
			LK.effects.flashScreen(0xff0000, 1000);
			LK.showGameOver();
		}
	}
	// Update score based on the dot's survival time
	var currentScore = Math.floor(LK.ticks / 60);
	LK.setScore(currentScore);
	scoreTxt.setText(LK.getScore().toString());
});

===================================================================
--- original.js
+++ change.js
@@ -51,8 +51,14 @@
 	var starGraphics = self.attachAsset('star', {
 		anchorX: 0.5,
 		anchorY: 0.5
 	});
+	self.moveDown = function (distance) {
+		self.y += distance;
+		if (self.y > 2732 - self.height / 2) {
+			self.y = -self.height / 2;
+		}
+	};
 });
 
 /**** 
 * Initialize Game
@@ -100,10 +106,13 @@
 	dot.update();
 	for (var i = 0; i < obstacles.length; i++) {
 		obstacles[i].move();
 		if (dot.y < 1800 && dot.movedDistance < 0) {
-			// If the dot moved up and its y position is less than 1400
+			// If the dot moved up and its y position is less than 1800
 			obstacles[i].moveDown(-dot.movedDistance);
+			stars.forEach(function (star) {
+				star.moveDown(-dot.movedDistance);
+			});
 		}
 		if (dot.intersects(obstacles[i])) {
 			LK.effects.flashScreen(0xff0000, 1000);
 			LK.showGameOver();