/**** 
* 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 = gameSpeed;
	self.collected = false;
	self.update = function () {
		self.y += self.speed;
		self.rotation += 0.1;
	};
	return self;
});
var Obstacle = Container.expand(function () {
	var self = Container.call(this);
	var obstacleGraphics = self.attachAsset('obstacle', {
		anchorX: 0.5,
		anchorY: 1.0
	});
	self.speed = gameSpeed;
	self.update = function () {
		self.y += self.speed;
	};
	return self;
});
var Player = Container.expand(function () {
	var self = Container.call(this);
	var playerGraphics = self.attachAsset('player', {
		anchorX: 0.5,
		anchorY: 1.0
	});
	self.groundY = 2300;
	self.jumpSpeed = 0;
	self.isJumping = false;
	self.gravity = 1.2;
	self.jumpPower = -22;
	self.lanes = [650, 1024, 1398]; // Three lanes
	self.currentLane = 1; // Middle lane
	self.targetX = self.lanes[self.currentLane];
	self.x = self.targetX;
	self.y = self.groundY;
	self.jump = function () {
		if (!self.isJumping) {
			self.jumpSpeed = self.jumpPower;
			self.isJumping = true;
			LK.getSound('jump').play();
			tween(self, {
				scaleX: 1.2,
				scaleY: 1.2
			}, {
				duration: 200,
				easing: tween.easeOut,
				onFinish: function onFinish() {
					tween(self, {
						scaleX: 1,
						scaleY: 1
					}, {
						duration: 200,
						easing: tween.easeIn
					});
				}
			});
		}
	};
	self.moveLeft = function () {
		if (self.currentLane > 0) {
			self.currentLane--;
			self.targetX = self.lanes[self.currentLane];
		}
	};
	self.moveRight = function () {
		if (self.currentLane < 2) {
			self.currentLane++;
			self.targetX = self.lanes[self.currentLane];
		}
	};
	self.update = function () {
		// Handle jumping
		if (self.isJumping) {
			self.jumpSpeed += self.gravity;
			self.y += self.jumpSpeed;
			if (self.y >= self.groundY) {
				self.y = self.groundY;
				self.isJumping = false;
				self.jumpSpeed = 0;
			}
		}
		// Handle lane switching
		var dx = self.targetX - self.x;
		if (Math.abs(dx) > 2) {
			self.x += dx * 0.15;
		} else {
			self.x = self.targetX;
		}
	};
	return self;
});

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

/**** 
* Game Code
****/ 
var player;
var obstacles = [];
var coins = [];
var gameSpeed = 8;
var maxSpeed = 20;
var speedIncrement = 0.005;
var distance = 0;
var obstacleSpawnTimer = 0;
var coinSpawnTimer = 0;
var lastSwipeX = 0;
var lastSwipeY = 0;
var swipeStarted = false;
// Create ground
var ground = game.attachAsset('ground', {
	anchorX: 0,
	anchorY: 1.0,
	x: 0,
	y: 2360
});
// Create player
player = game.addChild(new Player());
// Create score display
var scoreText = new Text2('Score: 0', {
	size: 60,
	fill: 0xFFFFFF
});
scoreText.anchor.set(0.5, 0);
LK.gui.top.addChild(scoreText);
// Create distance display
var distanceText = new Text2('Distance: 0m', {
	size: 50,
	fill: 0xFFFFFF
});
distanceText.anchor.set(0, 0);
distanceText.x = 50;
distanceText.y = 120;
LK.gui.topLeft.addChild(distanceText);
// Touch controls
game.down = function (x, y, obj) {
	lastSwipeX = x;
	lastSwipeY = y;
	swipeStarted = true;
};
game.up = function (x, y, obj) {
	if (swipeStarted) {
		var deltaX = x - lastSwipeX;
		var deltaY = y - lastSwipeY;
		var swipeThreshold = 100;
		if (Math.abs(deltaX) > Math.abs(deltaY)) {
			// Horizontal swipe
			if (deltaX > swipeThreshold) {
				player.moveRight();
			} else if (deltaX < -swipeThreshold) {
				player.moveLeft();
			}
		} else {
			// Vertical swipe or tap
			if (deltaY < -swipeThreshold || Math.abs(deltaX) < 50 && Math.abs(deltaY) < 50) {
				player.jump();
			}
		}
	}
	swipeStarted = false;
};
function spawnObstacle() {
	var obstacle = new Obstacle();
	var laneIndex = Math.floor(Math.random() * 3);
	obstacle.x = player.lanes[laneIndex];
	obstacle.y = -100;
	obstacle.speed = gameSpeed;
	obstacle.scaleX = 0.7;
	obstacle.scaleY = 0.7;
	tween(obstacle, {
		scaleX: 1,
		scaleY: 1
	}, {
		duration: 400,
		easing: tween.easeOut
	});
	obstacles.push(obstacle);
	game.addChild(obstacle);
}
function spawnCoin() {
	var coin = new Coin();
	var laneIndex = Math.floor(Math.random() * 3);
	coin.x = player.lanes[laneIndex];
	coin.y = -50;
	coin.speed = gameSpeed;
	coin.scaleX = 0.5;
	coin.scaleY = 0.5;
	tween(coin, {
		scaleX: 1,
		scaleY: 1
	}, {
		duration: 500,
		easing: tween.easeOut
	});
	coins.push(coin);
	game.addChild(coin);
}
// Main game loop
game.update = function () {
	// Increase game speed gradually
	if (gameSpeed < maxSpeed) {
		gameSpeed += speedIncrement;
	}
	// Update distance
	distance += gameSpeed * 0.1;
	distanceText.setText('Distance: ' + Math.floor(distance) + 'm');
	// Spawn obstacles
	obstacleSpawnTimer++;
	if (obstacleSpawnTimer > 60 + Math.random() * 60) {
		spawnObstacle();
		obstacleSpawnTimer = 0;
	}
	// Spawn coins
	coinSpawnTimer++;
	if (coinSpawnTimer > 90 + Math.random() * 90) {
		spawnCoin();
		coinSpawnTimer = 0;
	}
	// Update obstacles
	for (var i = obstacles.length - 1; i >= 0; i--) {
		var obstacle = obstacles[i];
		obstacle.speed = gameSpeed;
		// Remove obstacles that are off screen
		if (obstacle.y > 2800) {
			obstacle.destroy();
			obstacles.splice(i, 1);
			continue;
		}
		// Check collision with player
		if (player.intersects(obstacle)) {
			LK.effects.flashScreen(0xff0000, 1000);
			LK.showGameOver();
			return;
		}
	}
	// Update coins
	for (var j = coins.length - 1; j >= 0; j--) {
		var coin = coins[j];
		coin.speed = gameSpeed;
		// Remove coins that are off screen
		if (coin.y > 2800) {
			coin.destroy();
			coins.splice(j, 1);
			continue;
		}
		// Check collection
		if (!coin.collected && player.intersects(coin)) {
			coin.collected = true;
			LK.setScore(LK.getScore() + 10);
			scoreText.setText('Score: ' + LK.getScore());
			LK.getSound('collect').play();
			// Visual effect
			tween(coin, {
				alpha: 0,
				scaleX: 2,
				scaleY: 2
			}, {
				duration: 300,
				onFinish: function onFinish() {
					coin.destroy();
				}
			});
			coins.splice(j, 1);
		}
	}
	// Add distance bonus to score
	if (LK.ticks % 60 === 0) {
		LK.setScore(LK.getScore() + 1);
		scoreText.setText('Score: ' + LK.getScore());
	}
};
// Start background music
LK.playMusic('bgmusic');

===================================================================
--- original.js
+++ change.js
@@ -52,8 +52,24 @@
 		if (!self.isJumping) {
 			self.jumpSpeed = self.jumpPower;
 			self.isJumping = true;
 			LK.getSound('jump').play();
+			tween(self, {
+				scaleX: 1.2,
+				scaleY: 1.2
+			}, {
+				duration: 200,
+				easing: tween.easeOut,
+				onFinish: function onFinish() {
+					tween(self, {
+						scaleX: 1,
+						scaleY: 1
+					}, {
+						duration: 200,
+						easing: tween.easeIn
+					});
+				}
+			});
 		}
 	};
 	self.moveLeft = function () {
 		if (self.currentLane > 0) {
@@ -168,8 +184,17 @@
 	var laneIndex = Math.floor(Math.random() * 3);
 	obstacle.x = player.lanes[laneIndex];
 	obstacle.y = -100;
 	obstacle.speed = gameSpeed;
+	obstacle.scaleX = 0.7;
+	obstacle.scaleY = 0.7;
+	tween(obstacle, {
+		scaleX: 1,
+		scaleY: 1
+	}, {
+		duration: 400,
+		easing: tween.easeOut
+	});
 	obstacles.push(obstacle);
 	game.addChild(obstacle);
 }
 function spawnCoin() {
@@ -177,8 +202,17 @@
 	var laneIndex = Math.floor(Math.random() * 3);
 	coin.x = player.lanes[laneIndex];
 	coin.y = -50;
 	coin.speed = gameSpeed;
+	coin.scaleX = 0.5;
+	coin.scaleY = 0.5;
+	tween(coin, {
+		scaleX: 1,
+		scaleY: 1
+	}, {
+		duration: 500,
+		easing: tween.easeOut
+	});
 	coins.push(coin);
 	game.addChild(coin);
 }
 // Main game loop