/**** 
* Plugins
****/ 
var tween = LK.import("@upit/tween.v1");
var storage = LK.import("@upit/storage.v1", {
	coins: 0,
	unlockedSkins: ["default"]
});

/**** 
* Classes
****/ 
var Bullet = Container.expand(function () {
	var self = Container.call(this);
	var graphics = self.attachAsset('bullet', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.baseSpeedX = (Math.random() - 0.5) * 6;
	self.baseSpeedY = Math.random() * 4 + 2;
	self.update = function () {
		// Apply difficulty multiplier to speed - double every level
		var speedMultiplier = Math.pow(2, difficultyLevel - 1);
		self.x += self.baseSpeedX * speedMultiplier;
		self.y += self.baseSpeedY * speedMultiplier;
	};
	return self;
});
var Coin = Container.expand(function () {
	var self = Container.call(this);
	var graphics = self.attachAsset('coin', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.bobSpeed = Math.random() * 0.15 + 0.08;
	self.bobOffset = Math.random() * Math.PI * 2;
	self.update = function () {
		// Gentle bobbing animation and rotation
		graphics.y = Math.sin(LK.ticks * self.bobSpeed + self.bobOffset) * 8;
		graphics.rotation += 0.05;
		graphics.scaleX = 1 + Math.sin(LK.ticks * 0.1) * 0.1;
		graphics.scaleY = 1 + Math.sin(LK.ticks * 0.1) * 0.1;
	};
	return self;
});
var Enemy = Container.expand(function () {
	var self = Container.call(this);
	var graphics = self.attachAsset('enemy', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.baseSpeedX = (Math.random() - 0.5) * 4;
	self.baseSpeedY = Math.random() * 3 + 1;
	self.update = function () {
		// Apply difficulty multiplier to speed - double every level
		var speedMultiplier = Math.pow(2, difficultyLevel - 1);
		self.x += self.baseSpeedX * speedMultiplier;
		self.y += self.baseSpeedY * speedMultiplier;
		// Bounce off screen edges
		if (self.x <= 30 || self.x >= 2018) {
			self.baseSpeedX *= -1;
		}
	};
	return self;
});
var Player = Container.expand(function () {
	var self = Container.call(this);
	var graphics = self.attachAsset('player', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.update = function () {
		// Keep player at normal appearance
		graphics.alpha = 1.0;
		graphics.scaleX = 1.0;
		graphics.scaleY = 1.0;
	};
	return self;
});
var PowerUp = Container.expand(function () {
	var self = Container.call(this);
	var graphics = self.attachAsset('powerup', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.bobSpeed = Math.random() * 0.1 + 0.05;
	self.bobOffset = Math.random() * Math.PI * 2;
	self.update = function () {
		// Gentle bobbing animation
		graphics.y = Math.sin(LK.ticks * self.bobSpeed + self.bobOffset) * 5;
		graphics.rotation += 0.02;
	};
	return self;
});
var Shop = Container.expand(function () {
	var self = Container.call(this);
	// Shop background
	var background = LK.getAsset('shop', {
		width: 1800,
		height: 2200,
		color: 0x2C3E50,
		shape: 'box'
	});
	background.anchorX = 0.5;
	background.anchorY = 0.5;
	background.alpha = 0.95;
	self.addChild(background);
	// Shop title
	var title = new Text2('SHOP', {
		size: 100,
		fill: 0xFFD700
	});
	title.anchor.set(0.5, 0.5);
	title.x = 0;
	title.y = -900;
	self.addChild(title);
	// Coins display
	self.coinsText = new Text2('Coins: ' + storage.coins, {
		size: 60,
		fill: 0xFFD700
	});
	self.coinsText.anchor.set(0.5, 0.5);
	self.coinsText.x = 0;
	self.coinsText.y = -800;
	self.addChild(self.coinsText);
	// Close button
	var closeBtn = LK.getAsset('closeBtn', {
		width: 120,
		height: 120,
		color: 0xE74C3C,
		shape: 'box'
	});
	closeBtn.anchorX = 0.5;
	closeBtn.anchorY = 0.5;
	closeBtn.x = 800;
	closeBtn.y = -900;
	self.addChild(closeBtn);
	var closeText = new Text2('X', {
		size: 80,
		fill: 0xFFFFFF
	});
	closeText.anchor.set(0.5, 0.5);
	closeText.x = 800;
	closeText.y = -900;
	self.addChild(closeText);
	// Skin items
	self.skins = [{
		name: 'default',
		color: 0x4caf50,
		price: 0,
		unlocked: true
	}, {
		name: 'red',
		color: 0xF44336,
		price: 50,
		unlocked: storage.unlockedSkins.indexOf('red') !== -1
	}, {
		name: 'orange',
		color: 0xFF9800,
		price: 100,
		unlocked: storage.unlockedSkins.indexOf('orange') !== -1
	}, {
		name: 'blue',
		color: 0x2196F3,
		price: 150,
		unlocked: storage.unlockedSkins.indexOf('blue') !== -1
	}, {
		name: 'yellow',
		color: 0xFFEB3B,
		price: 200,
		unlocked: storage.unlockedSkins.indexOf('yellow') !== -1
	}, {
		name: 'purple',
		color: 0x9C27B0,
		price: 250,
		unlocked: storage.unlockedSkins.indexOf('purple') !== -1
	}];
	self.skinButtons = [];
	for (var i = 0; i < self.skins.length; i++) {
		var skin = self.skins[i];
		var yPos = -500 + i * 200;
		// Skin preview
		var skinPreview = LK.getAsset('skinPreview' + i, {
			width: 80,
			height: 80,
			color: skin.color,
			shape: 'ellipse'
		});
		skinPreview.anchorX = 0.5;
		skinPreview.anchorY = 0.5;
		skinPreview.x = -400;
		skinPreview.y = yPos;
		self.addChild(skinPreview);
		// Skin name
		var nameText = new Text2(skin.name.toUpperCase(), {
			size: 50,
			fill: 0xFFFFFF
		});
		nameText.anchor.set(0, 0.5);
		nameText.x = -300;
		nameText.y = yPos - 30;
		self.addChild(nameText);
		// Price or status
		var statusText;
		if (skin.unlocked) {
			statusText = new Text2('OWNED', {
				size: 40,
				fill: 0x4CAF50
			});
		} else {
			statusText = new Text2(skin.price + ' coins', {
				size: 40,
				fill: 0xFFD700
			});
		}
		statusText.anchor.set(0, 0.5);
		statusText.x = -300;
		statusText.y = yPos + 30;
		self.addChild(statusText);
		// Buy/Use button
		var button = LK.getAsset('shopBtn' + i, {
			width: 200,
			height: 80,
			color: skin.unlocked ? 0x4CAF50 : 0x2196F3,
			shape: 'box'
		});
		button.anchorX = 0.5;
		button.anchorY = 0.5;
		button.x = 400;
		button.y = yPos;
		button.skinIndex = i;
		self.addChild(button);
		self.skinButtons.push(button);
		var buttonText = new Text2(skin.unlocked ? 'USE' : 'BUY', {
			size: 40,
			fill: 0xFFFFFF
		});
		buttonText.anchor.set(0.5, 0.5);
		buttonText.x = 400;
		buttonText.y = yPos;
		self.addChild(buttonText);
	}
	self.down = function (x, y, obj) {
		var localPos = self.toLocal(obj.parent.toGlobal(obj.position));
		// Close button
		if (localPos.x > 740 && localPos.x < 860 && localPos.y > -960 && localPos.y < -840) {
			showShop = false;
			self.visible = false;
			return;
		}
		// Check skin buttons
		for (var i = 0; i < self.skinButtons.length; i++) {
			var button = self.skinButtons[i];
			var skin = self.skins[i];
			if (localPos.x > 300 && localPos.x < 500 && localPos.y > -500 + i * 200 - 40 && localPos.y < -500 + i * 200 + 40) {
				if (skin.unlocked) {
					// Use skin
					currentSkin = skin.name;
					storage.currentSkin = currentSkin;
					updatePlayerSkin();
				} else {
					// Buy skin
					if (storage.coins >= skin.price) {
						storage.coins -= skin.price;
						storage.unlockedSkins.push(skin.name);
						skin.unlocked = true;
						currentSkin = skin.name;
						storage.currentSkin = currentSkin;
						updatePlayerSkin();
						self.updateShop();
					}
				}
				break;
			}
		}
	};
	self.updateShop = function () {
		self.coinsText.setText('Coins: ' + storage.coins);
		for (var i = 0; i < self.skins.length; i++) {
			self.skins[i].unlocked = storage.unlockedSkins.indexOf(self.skins[i].name) !== -1;
		}
	};
	return self;
});

/**** 
* Initialize Game
****/ 
var game = new LK.Game({
	backgroundColor: 0x1A1A2E
});

/**** 
* Game Code
****/ 
var player;
var enemies = [];
var bullets = [];
var powerups = [];
var coins = [];
var survivalTime = 0;
var spawnTimer = 0;
var difficultyLevel = 1;
var dragNode = null;
var levelTimer = 0;
var baseEnemySpeed = 3;
var baseBulletSpeed = 4;
var showShop = false;
var shop;
var currentSkin = storage.currentSkin || 'default';
// Initialize score display
var scoreTxt = new Text2('Score: 0', {
	size: 60,
	fill: 0xFFFFFF
});
scoreTxt.anchor.set(0.5, 0);
LK.gui.top.addChild(scoreTxt);
// Initialize level display
var levelTxt = new Text2('Level: 1', {
	size: 60,
	fill: 0xFFD700
});
levelTxt.anchor.set(0.5, 0);
levelTxt.x = 2048 / 2;
levelTxt.y = 60;
LK.gui.addChild(levelTxt);
// Initialize coins display
var coinsTxt = new Text2('Coins: ' + storage.coins, {
	size: 50,
	fill: 0xFFD700
});
coinsTxt.anchor.set(1, 0);
coinsTxt.x = 2048 - 20;
coinsTxt.y = 20;
LK.gui.addChild(coinsTxt);
// Initialize shop button
var shopBtn = LK.getAsset('shopButton', {
	width: 150,
	height: 80,
	color: 0x9C27B0,
	shape: 'box'
});
shopBtn.anchorX = 0;
shopBtn.anchorY = 1;
shopBtn.x = 38; // 1cm from left edge (approximately 38px)
shopBtn.y = LK.gui.height - 38; // 1cm from bottom edge
LK.gui.addChild(shopBtn);
var shopBtnText = new Text2('SHOP', {
	size: 40,
	fill: 0xFFFFFF
});
shopBtnText.anchor.set(0.5, 0.5);
shopBtnText.x = 113; // Center of button (38 + 150/2)
shopBtnText.y = LK.gui.height - 78; // Center of button vertically
LK.gui.addChild(shopBtnText);
// Create player
player = game.addChild(new Player());
player.x = 2048 / 2;
player.y = 2732 / 2;
// Create shop
shop = new Shop();
shop.x = 2048 / 2;
shop.y = 2732 / 2;
shop.visible = false;
game.addChild(shop);
// Function to update player skin
function updatePlayerSkin() {
	var skinColors = {
		'default': 0x4caf50,
		'red': 0xF44336,
		'orange': 0xFF9800,
		'blue': 0x2196F3,
		'yellow': 0xFFEB3B,
		'purple': 0x9C27B0
	};
	if (player && player.children[0]) {
		player.children[0].tint = skinColors[currentSkin] || skinColors['default'];
	}
}
// Apply current skin
updatePlayerSkin();
// Movement handling
function handleMove(x, y, obj) {
	if (dragNode && !showShop) {
		dragNode.x = Math.max(40, Math.min(2008, x));
		dragNode.y = Math.max(40, Math.min(2692, y));
	}
}
game.move = handleMove;
game.down = function (x, y, obj) {
	// Check shop button click (bottom left corner)
	if (x > 38 && x < 188 && y > LK.gui.height - 118 && y < LK.gui.height - 38) {
		showShop = !showShop;
		shop.visible = showShop;
		if (showShop) {
			shop.updateShop();
		}
		return;
	}
	// Only allow player movement if shop is not open
	if (!showShop) {
		dragNode = player;
		handleMove(x, y, obj);
	}
};
game.up = function (x, y, obj) {
	dragNode = null;
};
// Spawn enemies
function spawnEnemy() {
	var enemy = new Enemy();
	enemy.x = Math.random() * 1900 + 100;
	enemy.y = -50;
	enemies.push(enemy);
	game.addChild(enemy);
}
// Spawn bullets
function spawnBullet() {
	var bullet = new Bullet();
	bullet.x = Math.random() * 2048;
	bullet.y = -30;
	bullets.push(bullet);
	game.addChild(bullet);
}
// Spawn power-ups
function spawnPowerUp() {
	var powerup = new PowerUp();
	powerup.x = Math.random() * 1800 + 124;
	powerup.y = Math.random() * 2000 + 100;
	powerups.push(powerup);
	game.addChild(powerup);
}
// Spawn coins
function spawnCoin() {
	var coin = new Coin();
	coin.x = Math.random() * 1800 + 124;
	coin.y = Math.random() * 2000 + 100;
	coins.push(coin);
	game.addChild(coin);
}
// Update game state
game.update = function () {
	// Update game progression
	survivalTime++;
	levelTimer++;
	spawnTimer++;
	// Update score
	LK.setScore(Math.floor(survivalTime / 60) * 10);
	scoreTxt.setText('Score: ' + LK.getScore());
	// Increase difficulty every 10 seconds (600 ticks at 60fps)
	if (levelTimer >= 600) {
		difficultyLevel++;
		levelTimer = 0;
		levelTxt.setText('Level: ' + difficultyLevel);
		// Flash screen to indicate level up
		LK.effects.flashScreen(0x00FF00, 300);
	}
	// Spawn enemies
	if (spawnTimer % Math.max(120 - difficultyLevel * 10, 30) === 0) {
		spawnEnemy();
	}
	// Spawn bullets
	if (spawnTimer % Math.max(90 - difficultyLevel * 5, 20) === 0) {
		spawnBullet();
	}
	// Spawn power-ups
	if (spawnTimer % 600 === 0) {
		spawnPowerUp();
	}
	// Spawn coins
	if (spawnTimer % 180 === 0) {
		spawnCoin();
	}
	// Handle enemy collisions and cleanup
	for (var i = enemies.length - 1; i >= 0; i--) {
		var enemy = enemies[i];
		// Remove off-screen enemies
		if (enemy.y > 2800) {
			enemy.destroy();
			enemies.splice(i, 1);
			continue;
		}
		// Check collision with player
		if (enemy.intersects(player)) {
			LK.getSound('enemyHit').play();
			LK.effects.flashScreen(0xFF0000, 500);
			LK.showGameOver();
			return;
		}
	}
	// Handle bullet collisions and cleanup
	for (var i = bullets.length - 1; i >= 0; i--) {
		var bullet = bullets[i];
		// Remove off-screen bullets
		if (bullet.y > 2800 || bullet.x < -50 || bullet.x > 2098) {
			bullet.destroy();
			bullets.splice(i, 1);
			continue;
		}
		// Check collision with player
		if (bullet.intersects(player)) {
			LK.getSound('enemyHit').play();
			LK.effects.flashScreen(0xFF0000, 500);
			LK.showGameOver();
			return;
		}
	}
	// Handle power-up collisions
	for (var i = powerups.length - 1; i >= 0; i--) {
		var powerup = powerups[i];
		if (powerup.intersects(player)) {
			LK.getSound('collect').play();
			LK.setScore(LK.getScore() + 50);
			scoreTxt.setText('Score: ' + LK.getScore());
			LK.effects.flashObject(player, 0x2196F3, 300);
			powerup.destroy();
			powerups.splice(i, 1);
		}
	}
	// Handle coin collisions
	for (var i = coins.length - 1; i >= 0; i--) {
		var coin = coins[i];
		if (coin.intersects(player)) {
			LK.getSound('collect').play();
			storage.coins += 10;
			coinsTxt.setText('Coins: ' + storage.coins);
			LK.effects.flashObject(player, 0xFFD700, 300);
			coin.destroy();
			coins.splice(i, 1);
		}
	}
	// Win condition
	if (LK.getScore() >= 1000) {
		LK.showYouWin();
	}
};

===================================================================
--- original.js
+++ change.js
@@ -340,19 +340,19 @@
 	color: 0x9C27B0,
 	shape: 'box'
 });
 shopBtn.anchorX = 0;
-shopBtn.anchorY = 0;
-shopBtn.x = 120;
-shopBtn.y = 20;
+shopBtn.anchorY = 1;
+shopBtn.x = 38; // 1cm from left edge (approximately 38px)
+shopBtn.y = LK.gui.height - 38; // 1cm from bottom edge
 LK.gui.addChild(shopBtn);
 var shopBtnText = new Text2('SHOP', {
 	size: 40,
 	fill: 0xFFFFFF
 });
 shopBtnText.anchor.set(0.5, 0.5);
-shopBtnText.x = 195;
-shopBtnText.y = 60;
+shopBtnText.x = 113; // Center of button (38 + 150/2)
+shopBtnText.y = LK.gui.height - 78; // Center of button vertically
 LK.gui.addChild(shopBtnText);
 // Create player
 player = game.addChild(new Player());
 player.x = 2048 / 2;
@@ -387,10 +387,10 @@
 	}
 }
 game.move = handleMove;
 game.down = function (x, y, obj) {
-	// Check shop button click
-	if (x > 120 && x < 270 && y > 20 && y < 100) {
+	// Check shop button click (bottom left corner)
+	if (x > 38 && x < 188 && y > LK.gui.height - 118 && y < LK.gui.height - 38) {
 		showShop = !showShop;
 		shop.visible = showShop;
 		if (showShop) {
 			shop.updateShop();