/**** 
* Plugins
****/ 
var tween = LK.import("@upit/tween.v1");

/**** 
* Classes
****/ 
var Coin = Container.expand(function () {
	var self = Container.call(this);
	var coinGraphics = self.attachAsset('coin', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.speed = -8;
	self.value = 10;
	self.bobOffset = 0;
	self.update = function () {
		self.x += self.speed;
		// Add bobbing animation
		self.bobOffset += 0.1;
		coinGraphics.y = Math.sin(self.bobOffset) * 10;
	};
	return self;
});
var Player = Container.expand(function () {
	var self = Container.call(this);
	var playerGraphics = self.attachAsset('player', {
		anchorX: 0.5,
		anchorY: 1.0
	});
	self.velocityY = 0;
	self.isJumping = false;
	self.jumpForce = -35;
	self.gravity = 1.2;
	self.groundY = 2532; // Ground level
	self.update = function () {
		// Apply gravity
		self.velocityY += self.gravity;
		self.y += self.velocityY;
		// Check ground collision
		if (self.y >= self.groundY) {
			self.y = self.groundY;
			self.velocityY = 0;
			self.isJumping = false;
		}
	};
	self.jump = function () {
		if (!self.isJumping) {
			self.velocityY = self.jumpForce;
			self.isJumping = true;
			LK.getSound('jump').play();
		}
	};
	return self;
});
var Star = Container.expand(function () {
	var self = Container.call(this);
	var starGraphics = self.attachAsset('star', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.speed = -8;
	self.value = 50;
	self.rotationSpeed = 0.1;
	self.update = function () {
		self.x += self.speed;
		starGraphics.rotation += self.rotationSpeed;
	};
	return self;
});
var Turtle = Container.expand(function () {
	var self = Container.call(this);
	var turtleGraphics = self.attachAsset('turtle', {
		anchorX: 0.5,
		anchorY: 1.0
	});
	self.speed = -8;
	self.groundY = 2532;
	self.update = function () {
		self.x += self.speed;
	};
	return self;
});

/**** 
* Initialize Game
****/ 
var game = new LK.Game({
	backgroundColor: 0x87CEEB
});

/**** 
* Game Code
****/ 
// Game variables
var gameSpeed = 8;
var spawnTimer = 0;
var difficultyTimer = 0;
var distance = 0;
var scoreMultiplier = 1;
// Game objects
var player;
var ground;
var turtles = [];
var coins = [];
var stars = [];
// UI elements
var scoreTxt = new Text2('0', {
	size: 100,
	fill: 0xFFFFFF
});
scoreTxt.anchor.set(0.5, 0);
LK.gui.top.addChild(scoreTxt);
var distanceTxt = new Text2('0m', {
	size: 80,
	fill: 0xFFFFFF
});
distanceTxt.anchor.set(1, 0);
LK.gui.topRight.addChild(distanceTxt);
// Initialize game elements
function initializeGame() {
	// Create ground
	ground = game.addChild(LK.getAsset('ground', {
		anchorX: 0,
		anchorY: 1
	}));
	ground.x = 0;
	ground.y = 2732;
	// Create player
	player = game.addChild(new Player());
	player.x = 300;
	player.y = 2532;
	// Start background music
	LK.playMusic('bgmusic');
}
// Spawn turtle enemy
function spawnTurtle() {
	var turtle = new Turtle();
	turtle.x = 2200;
	turtle.y = 2532;
	turtle.speed = -(gameSpeed + Math.random() * 4);
	turtles.push(turtle);
	game.addChild(turtle);
}
// Spawn coin
function spawnCoin() {
	var coin = new Coin();
	coin.x = 2200;
	coin.y = 2400 - Math.random() * 300;
	coin.speed = -gameSpeed;
	coins.push(coin);
	game.addChild(coin);
}
// Spawn star
function spawnStar() {
	var star = new Star();
	star.x = 2200;
	star.y = 2300 - Math.random() * 200;
	star.speed = -gameSpeed;
	stars.push(star);
	game.addChild(star);
}
// Touch controls
game.down = function (x, y, obj) {
	player.jump();
};
// Main game loop
game.update = function () {
	// Update distance
	distance += gameSpeed / 10;
	distanceTxt.setText(Math.floor(distance) + 'm');
	// Increase difficulty over time
	difficultyTimer++;
	if (difficultyTimer % 1800 === 0) {
		// Every 30 seconds
		gameSpeed += 0.5;
	}
	// Spawn enemies and collectibles
	spawnTimer++;
	// Spawn turtles
	if (spawnTimer % 120 === 0) {
		spawnTurtle();
	}
	// Spawn coins
	if (spawnTimer % 180 === 0) {
		spawnCoin();
	}
	// Spawn stars (less frequent)
	if (spawnTimer % 480 === 0) {
		spawnStar();
	}
	// Update and check turtles
	for (var i = turtles.length - 1; i >= 0; i--) {
		var turtle = turtles[i];
		// Remove if off screen
		if (turtle.x < -100) {
			turtle.destroy();
			turtles.splice(i, 1);
			continue;
		}
		// Check collision with player
		if (turtle.intersects(player)) {
			LK.effects.flashScreen(0xff0000, 1000);
			LK.showGameOver();
			return;
		}
	}
	// Update and check coins
	for (var i = coins.length - 1; i >= 0; i--) {
		var coin = coins[i];
		// Remove if off screen
		if (coin.x < -100) {
			coin.destroy();
			coins.splice(i, 1);
			continue;
		}
		// Check collection
		if (coin.intersects(player)) {
			LK.setScore(LK.getScore() + coin.value * scoreMultiplier);
			scoreTxt.setText(LK.getScore());
			LK.getSound('coin').play();
			coin.destroy();
			coins.splice(i, 1);
		}
	}
	// Update and check stars
	for (var i = stars.length - 1; i >= 0; i--) {
		var star = stars[i];
		// Remove if off screen
		if (star.x < -100) {
			star.destroy();
			stars.splice(i, 1);
			continue;
		}
		// Check collection
		if (star.intersects(player)) {
			LK.setScore(LK.getScore() + star.value * scoreMultiplier);
			scoreTxt.setText(LK.getScore());
			scoreMultiplier += 0.1;
			LK.getSound('star').play();
			LK.effects.flashObject(star, 0xFFFFFF, 500);
			star.destroy();
			stars.splice(i, 1);
		}
	}
	// Add distance to score
	LK.setScore(LK.getScore() + Math.floor(gameSpeed / 10));
	scoreTxt.setText(LK.getScore());
};
// Initialize the game
initializeGame();

===================================================================
--- original.js
+++ change.js
@@ -30,9 +30,9 @@
 		anchorY: 1.0
 	});
 	self.velocityY = 0;
 	self.isJumping = false;
-	self.jumpForce = -25;
+	self.jumpForce = -35;
 	self.gravity = 1.2;
 	self.groundY = 2532; // Ground level
 	self.update = function () {
 		// Apply gravity