===================================================================
--- original.js
+++ change.js
@@ -1,6 +1,594 @@
-/****
+/**** 
+* Plugins
+****/ 
+var tween = LK.import("@upit/tween.v1");
+var storage = LK.import("@upit/storage.v1", {
+	money: 0,
+	unlockedSkins: ["ship_default"],
+	selectedSkin: "ship_default",
+	upgrades: {
+		fireRate: 1,
+		speed: 1,
+		shield: 1
+	}
+});
+
+/**** 
+* Classes
+****/ 
+// Coin (Money)
+var Coin = Container.expand(function () {
+	var self = Container.call(this);
+	var g = self.attachAsset('coin', {
+		anchorX: 0.5,
+		anchorY: 0.5
+	});
+	self.speed = 10;
+	self.update = function () {
+		self.y += self.speed;
+	};
+	return self;
+});
+// Enemy Bullet
+var EnemyBullet = Container.expand(function () {
+	var self = Container.call(this);
+	var g = self.attachAsset('enemy_bullet', {
+		anchorX: 0.5,
+		anchorY: 0.5
+	});
+	self.speed = 22;
+	self.update = function () {
+		self.y += self.speed;
+	};
+	return self;
+});
+// Enemy Ship
+var EnemyShip = Container.expand(function () {
+	var self = Container.call(this);
+	var g = self.attachAsset('enemy_ship', {
+		anchorX: 0.5,
+		anchorY: 0.5
+	});
+	self.width = g.width;
+	self.height = g.height;
+	self.speed = 6 + Math.random() * 4 + wave * 0.5;
+	self.fireCooldown = 30 + Math.floor(Math.random() * 30);
+	self.hp = 1 + Math.floor(wave / 3);
+	self.update = function () {
+		self.y += self.speed;
+		if (self.fireCooldown > 0) {
+			self.fireCooldown--;
+		} else {
+			self.shoot();
+			self.fireCooldown = 60 + Math.floor(Math.random() * 60);
+		}
+	};
+	self.shoot = function () {
+		var bullet = new EnemyBullet();
+		bullet.x = self.x;
+		bullet.y = self.y + self.height / 2 + bullet.height / 2;
+		enemyBullets.push(bullet);
+		game.addChild(bullet);
+	};
+	self.takeHit = function () {
+		self.hp--;
+		if (self.hp <= 0) {
+			LK.getSound('enemy_explode').play();
+			spawnCoin(self.x, self.y);
+			LK.setScore(LK.getScore() + 1);
+			updateScoreText();
+			self.destroy();
+			var idx = enemies.indexOf(self);
+			if (idx !== -1) enemies.splice(idx, 1);
+		} else {
+			LK.effects.flashObject(self, 0xffffff, 200);
+		}
+	};
+	return self;
+});
+// Player Bullet
+var PlayerBullet = Container.expand(function () {
+	var self = Container.call(this);
+	var g = self.attachAsset('player_bullet', {
+		anchorX: 0.5,
+		anchorY: 0.5
+	});
+	self.speed = -36;
+	self.update = function () {
+		self.y += self.speed;
+	};
+	return self;
+});
+// Player Ship
+var PlayerShip = Container.expand(function () {
+	var self = Container.call(this);
+	// Attach current skin asset
+	self.skinId = storage.selectedSkin || 'ship_default';
+	self.skin = self.attachAsset(self.skinId, {
+		anchorX: 0.5,
+		anchorY: 0.5
+	});
+	self.width = self.skin.width;
+	self.height = self.skin.height;
+	self.speed = 18 + 6 * (storage.upgrades.speed - 1); // base speed + upgrade
+	self.fireCooldown = 0;
+	self.fireRate = 18 - 3 * (storage.upgrades.fireRate - 1); // lower is faster
+	self.shield = storage.upgrades.shield;
+	self.invulnTicks = 0;
+	self.setSkin = function (skinId) {
+		if (self.skin) self.removeChild(self.skin);
+		self.skinId = skinId;
+		self.skin = self.attachAsset(skinId, {
+			anchorX: 0.5,
+			anchorY: 0.5
+		});
+		self.width = self.skin.width;
+		self.height = self.skin.height;
+	};
+	self.update = function () {
+		if (self.invulnTicks > 0) {
+			self.invulnTicks--;
+			if (self.invulnTicks % 6 < 3) {
+				self.skin.alpha = 0.4;
+			} else {
+				self.skin.alpha = 1;
+			}
+		} else {
+			self.skin.alpha = 1;
+		}
+		if (self.fireCooldown > 0) self.fireCooldown--;
+	};
+	self.shoot = function () {
+		if (self.fireCooldown > 0) return;
+		var bullet = new PlayerBullet();
+		bullet.x = self.x;
+		bullet.y = self.y - self.height / 2 - bullet.height / 2;
+		playerBullets.push(bullet);
+		game.addChild(bullet);
+		LK.getSound('shoot').play();
+		self.fireCooldown = self.fireRate;
+	};
+	self.takeHit = function () {
+		if (self.invulnTicks > 0) return;
+		self.shield--;
+		if (self.shield <= 0) {
+			LK.effects.flashScreen(0xff0000, 1000);
+			LK.showGameOver();
+		} else {
+			self.invulnTicks = 60;
+			LK.effects.flashObject(self, 0xff0000, 500);
+		}
+		updateShieldText();
+	};
+	return self;
+});
+
+/**** 
 * Initialize Game
-****/
+****/ 
 var game = new LK.Game({
-	backgroundColor: 0x000000
+	backgroundColor: 0x000010
+});
+
+/**** 
+* Game Code
+****/ 
+// Music
+// Sounds
+// Coin (money)
+// Enemy bullet
+// Enemy ship
+// Player bullet
+// Spaceship skin 3 (unlockable)
+// Spaceship skin 2 (unlockable)
+// Spaceship base skin (default)
+// Game state variables
+var player;
+var playerBullets = [];
+var enemies = [];
+var enemyBullets = [];
+var coins = [];
+var dragNode = null;
+var wave = 1;
+var waveTicks = 0;
+var waveCooldown = 120;
+var scoreTxt, moneyTxt, shieldTxt;
+var menuOpen = false;
+// GUI
+scoreTxt = new Text2('0', {
+	size: 100,
+	fill: "#fff"
+});
+scoreTxt.anchor.set(0.5, 0);
+LK.gui.top.addChild(scoreTxt);
+moneyTxt = new Text2('$0', {
+	size: 80,
+	fill: 0xFFE066
+});
+moneyTxt.anchor.set(1, 0);
+LK.gui.topRight.addChild(moneyTxt);
+shieldTxt = new Text2('🛡️3', {
+	size: 80,
+	fill: 0x66CCFF
+});
+shieldTxt.anchor.set(0, 0);
+LK.gui.topLeft.addChild(shieldTxt);
+// Menu button (top right, not top left)
+var menuBtn = new Text2('≡', {
+	size: 100,
+	fill: "#fff"
+});
+menuBtn.anchor.set(1, 0);
+menuBtn.x = -20;
+menuBtn.y = 20;
+LK.gui.topRight.addChild(menuBtn);
+// Menu overlay
+var menuOverlay = new Container();
+menuOverlay.visible = false;
+LK.gui.center.addChild(menuOverlay);
+// Menu background
+var menuBg = LK.getAsset('ship_default', {
+	width: 1200,
+	height: 1600,
+	color: 0x222233,
+	anchorX: 0.5,
+	anchorY: 0.5
+});
+menuBg.alpha = 0.98;
+menuOverlay.addChild(menuBg);
+// Menu title
+var menuTitle = new Text2('Upgrades & Skins', {
+	size: 100,
+	fill: "#fff"
+});
+menuTitle.anchor.set(0.5, 0);
+menuTitle.y = -700;
+menuOverlay.addChild(menuTitle);
+// Money display in menu
+var menuMoney = new Text2('$0', {
+	size: 80,
+	fill: 0xFFE066
+});
+menuMoney.anchor.set(0.5, 0);
+menuMoney.y = -600;
+menuOverlay.addChild(menuMoney);
+// Skins section
+var skinTitle = new Text2('Skins', {
+	size: 80,
+	fill: "#fff"
+});
+skinTitle.anchor.set(0.5, 0);
+skinTitle.y = -500;
+menuOverlay.addChild(skinTitle);
+var skinBtns = [];
+var skinIds = ['ship_default', 'ship_red', 'ship_green'];
+var skinCosts = {
+	ship_default: 0,
+	ship_red: 30,
+	ship_green: 60
+};
+for (var i = 0; i < skinIds.length; i++) {
+	(function (i) {
+		var sid = skinIds[i];
+		var btn = new Container();
+		btn.x = -300 + i * 300;
+		btn.y = -350;
+		var skinAsset = btn.attachAsset(sid, {
+			anchorX: 0.5,
+			anchorY: 0.5,
+			scaleX: 0.7,
+			scaleY: 0.7
+		});
+		var label = new Text2('', {
+			size: 40,
+			fill: "#fff"
+		});
+		label.anchor.set(0.5, 0);
+		label.y = 80;
+		btn.addChild(label);
+		btn.down = function (x, y, obj) {
+			if (storage.unlockedSkins.indexOf(sid) !== -1) {
+				storage.selectedSkin = sid;
+				player.setSkin(sid);
+				updateMenu();
+			} else if (storage.money >= skinCosts[sid]) {
+				storage.money -= skinCosts[sid];
+				storage.unlockedSkins.push(sid);
+				storage.selectedSkin = sid;
+				player.setSkin(sid);
+				updateMenu();
+				updateMoneyText();
+			}
+		};
+		menuOverlay.addChild(btn);
+		skinBtns.push({
+			btn: btn,
+			label: label,
+			sid: sid
+		});
+	})(i);
+}
+// Upgrades section
+var upgradeTitle = new Text2('Upgrades', {
+	size: 80,
+	fill: "#fff"
+});
+upgradeTitle.anchor.set(0.5, 0);
+upgradeTitle.y = -150;
+menuOverlay.addChild(upgradeTitle);
+var upgradeNames = ['fireRate', 'speed', 'shield'];
+var upgradeLabels = ['Fire Rate', 'Speed', 'Shield'];
+var upgradeCosts = {
+	fireRate: 20,
+	speed: 20,
+	shield: 25
+};
+var upgradeMax = {
+	fireRate: 5,
+	speed: 5,
+	shield: 5
+};
+var upgradeBtns = [];
+for (var i = 0; i < upgradeNames.length; i++) {
+	(function (i) {
+		var upg = upgradeNames[i];
+		var btn = new Container();
+		btn.x = -300 + i * 300;
+		btn.y = 0;
+		var label = new Text2('', {
+			size: 40,
+			fill: "#fff"
+		});
+		label.anchor.set(0.5, 0);
+		btn.addChild(label);
+		btn.down = function (x, y, obj) {
+			if (storage.upgrades[upg] < upgradeMax[upg] && storage.money >= upgradeCosts[upg]) {
+				storage.money -= upgradeCosts[upg];
+				storage.upgrades[upg]++;
+				updateMenu();
+				updateMoneyText();
+				if (upg === 'fireRate') player.fireRate = 18 - 3 * (storage.upgrades.fireRate - 1);
+				if (upg === 'speed') player.speed = 18 + 6 * (storage.upgrades.speed - 1);
+				if (upg === 'shield') {
+					player.shield = storage.upgrades.shield;
+					updateShieldText();
+				}
+			}
+		};
+		btn.y = 100;
+		btn.x = -300 + i * 300;
+		menuOverlay.addChild(btn);
+		upgradeBtns.push({
+			btn: btn,
+			label: label,
+			upg: upg
+		});
+	})(i);
+}
+// Menu close button
+var closeBtn = new Text2('Close', {
+	size: 80,
+	fill: "#fff"
+});
+closeBtn.anchor.set(0.5, 0);
+closeBtn.y = 600;
+closeBtn.down = function (x, y, obj) {
+	menuOverlay.visible = false;
+	menuOpen = false;
+};
+menuOverlay.addChild(closeBtn);
+// Menu button event
+menuBtn.down = function (x, y, obj) {
+	menuOverlay.visible = true;
+	menuOpen = true;
+	updateMenu();
+};
+// Update menu info
+function updateMenu() {
+	menuMoney.setText('$' + storage.money);
+	for (var i = 0; i < skinBtns.length; i++) {
+		var sid = skinBtns[i].sid;
+		if (storage.unlockedSkins.indexOf(sid) !== -1) {
+			skinBtns[i].label.setText(storage.selectedSkin === sid ? 'Selected' : 'Unlocked');
+		} else {
+			skinBtns[i].label.setText('Unlock: $' + skinCosts[sid]);
+		}
+	}
+	for (var i = 0; i < upgradeBtns.length; i++) {
+		var upg = upgradeBtns[i].upg;
+		var lvl = storage.upgrades[upg];
+		if (lvl >= upgradeMax[upg]) {
+			upgradeBtns[i].label.setText(upgradeLabels[i] + ': MAX');
+		} else {
+			upgradeBtns[i].label.setText(upgradeLabels[i] + ': ' + lvl + ' ($' + upgradeCosts[upg] + ')');
+		}
+	}
+}
+// Update score, money, shield
+function updateScoreText() {
+	scoreTxt.setText(LK.getScore());
+}
+function updateMoneyText() {
+	moneyTxt.setText('$' + storage.money);
+}
+function updateShieldText() {
+	shieldTxt.setText('🛡️' + player.shield);
+}
+// Spawn coin
+function spawnCoin(x, y) {
+	var coin = new Coin();
+	coin.x = x;
+	coin.y = y;
+	coins.push(coin);
+	game.addChild(coin);
+}
+// Start game
+function startGame() {
+	// Reset state
+	LK.setScore(0);
+	updateScoreText();
+	wave = 1;
+	waveTicks = 0;
+	playerBullets = [];
+	enemies = [];
+	enemyBullets = [];
+	coins = [];
+	menuOverlay.visible = false;
+	menuOpen = false;
+	// Remove all children except GUI
+	for (var i = game.children.length - 1; i >= 0; i--) {
+		game.children[i].destroy();
+	}
+	// Create player
+	player = new PlayerShip();
+	player.x = 2048 / 2;
+	player.y = 2732 - 300;
+	game.addChild(player);
+	updateShieldText();
+	updateMoneyText();
+}
+// Touch controls
+game.down = function (x, y, obj) {
+	if (menuOpen) return;
+	// Only drag if touch is on player
+	var px = player.x,
+		py = player.y;
+	var dx = x - px,
+		dy = y - py;
+	if (dx * dx + dy * dy < player.width / 2 * (player.width / 2)) {
+		dragNode = player;
+	}
+};
+game.up = function (x, y, obj) {
+	dragNode = null;
+};
+game.move = function (x, y, obj) {
+	if (menuOpen) return;
+	if (dragNode === player) {
+		// Clamp to screen
+		var nx = Math.max(player.width / 2, Math.min(2048 - player.width / 2, x));
+		var ny = Math.max(player.height / 2 + 100, Math.min(2732 - player.height / 2, y));
+		player.x = nx;
+		player.y = ny;
+	}
+};
+// Tap to shoot
+game.tap = function (x, y, obj) {
+	if (menuOpen) return;
+	player.shoot();
+};
+// Main update loop
+game.update = function () {
+	if (menuOpen) return;
+	// Player update
+	if (player) player.update();
+	// Player bullets
+	for (var i = playerBullets.length - 1; i >= 0; i--) {
+		var b = playerBullets[i];
+		b.update();
+		// Remove if off screen
+		if (b.y < -b.height) {
+			b.destroy();
+			playerBullets.splice(i, 1);
+			continue;
+		}
+		// Collide with enemies
+		for (var j = enemies.length - 1; j >= 0; j--) {
+			var e = enemies[j];
+			if (b.intersects(e)) {
+				e.takeHit();
+				b.destroy();
+				playerBullets.splice(i, 1);
+				break;
+			}
+		}
+	}
+	// Enemy update
+	for (var i = enemies.length - 1; i >= 0; i--) {
+		var e = enemies[i];
+		e.update();
+		if (e.y > 2732 + e.height) {
+			e.destroy();
+			enemies.splice(i, 1);
+			continue;
+		}
+		// Collide with player
+		if (player && e.intersects(player)) {
+			e.destroy();
+			enemies.splice(i, 1);
+			player.takeHit();
+			continue;
+		}
+	}
+	// Enemy bullets
+	for (var i = enemyBullets.length - 1; i >= 0; i--) {
+		var b = enemyBullets[i];
+		b.update();
+		if (b.y > 2732 + b.height) {
+			b.destroy();
+			enemyBullets.splice(i, 1);
+			continue;
+		}
+		if (player && b.intersects(player)) {
+			b.destroy();
+			enemyBullets.splice(i, 1);
+			player.takeHit();
+			continue;
+		}
+	}
+	// Coins
+	for (var i = coins.length - 1; i >= 0; i--) {
+		var c = coins[i];
+		c.update();
+		if (c.y > 2732 + c.height) {
+			c.destroy();
+			coins.splice(i, 1);
+			continue;
+		}
+		if (player && c.intersects(player)) {
+			LK.getSound('coin').play();
+			storage.money += 1;
+			updateMoneyText();
+			c.destroy();
+			coins.splice(i, 1);
+			continue;
+		}
+	}
+	// Spawn enemies in waves
+	if (enemies.length === 0 && waveCooldown === 0) {
+		wave++;
+		waveTicks = 0;
+		waveCooldown = 60;
+	}
+	if (waveCooldown > 0) {
+		waveCooldown--;
+		if (waveCooldown === 0) {
+			// Spawn new wave
+			var n = 2 + Math.floor(wave * 0.7);
+			for (var i = 0; i < n; i++) {
+				var e = new EnemyShip();
+				e.x = 200 + Math.random() * (2048 - 400);
+				e.y = -200 - i * 120;
+				enemies.push(e);
+				game.addChild(e);
+			}
+		}
+	}
+};
+// Start game and music
+startGame();
+LK.playMusic('bgmusic', {
+	fade: {
+		start: 0,
+		end: 1,
+		duration: 1000
+	}
+});
+// Reset game on game over
+LK.on('gameover', function () {
+	startGame();
+});
+// Reset game on win (not used in this endless shooter, but for completeness)
+LK.on('youwin', function () {
+	startGame();
 });
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