===================================================================
--- original.js
+++ change.js
@@ -1,6 +1,392 @@
-/****
+/**** 
+* Plugins
+****/ 
+var tween = LK.import("@upit/tween.v1");
+
+/**** 
+* Classes
+****/ 
+// Boss
+var Boss = Container.expand(function () {
+	var self = Container.call(this);
+	var boss = self.attachAsset('boss', {
+		anchorX: 0.5,
+		anchorY: 0.5
+	});
+	self.maxHp = 10;
+	self.hp = 10;
+	self.shootCooldown = 0;
+	self.patternTick = 0;
+	self.patternType = 0;
+	self.moveDir = 1;
+	self.moveSpeed = 6;
+	self.update = function () {
+		// Boss movement: horizontal oscillation
+		self.x += self.moveDir * self.moveSpeed;
+		if (self.x < 320) {
+			self.x = 320;
+			self.moveDir = 1;
+		}
+		if (self.x > 2048 - 320) {
+			self.x = 2048 - 320;
+			self.moveDir = -1;
+		}
+		self.patternTick++;
+	};
+	return self;
+});
+// Boss bullet
+var BossBullet = Container.expand(function () {
+	var self = Container.call(this);
+	var bullet = self.attachAsset('bossBullet', {
+		anchorX: 0.5,
+		anchorY: 0.5
+	});
+	self.speedY = 18;
+	self.speedX = 0;
+	self.update = function () {
+		self.x += self.speedX;
+		self.y += self.speedY;
+	};
+	return self;
+});
+// Player
+var Player = Container.expand(function () {
+	var self = Container.call(this);
+	var player = self.attachAsset('player', {
+		anchorX: 0.5,
+		anchorY: 0.5
+	});
+	self.cooldown = 0;
+	return self;
+});
+// Player bullet
+var PlayerBullet = Container.expand(function () {
+	var self = Container.call(this);
+	var bullet = self.attachAsset('playerBullet', {
+		anchorX: 0.5,
+		anchorY: 0.5
+	});
+	self.speed = -36;
+	self.update = function () {
+		self.y += self.speed;
+	};
+	return self;
+});
+
+/**** 
 * Initialize Game
-****/
+****/ 
 var game = new LK.Game({
-	backgroundColor: 0x000000
+	backgroundColor: 0x181a1b
+});
+
+/**** 
+* Game Code
+****/ 
+// Music
+// Sound effects
+// Boss HP bar background
+// Boss HP bar
+// Boss
+// Player
+// Boss bullet
+// Player bullet
+// Game state variables
+var currentLevel = 1;
+var maxLevel = 10;
+var player, boss;
+var playerBullets = [];
+var bossBullets = [];
+var canShoot = true;
+var bossHpBar, bossHpBarBg, bossHpText;
+var scoreText, levelText;
+var isGameOver = false;
+var isYouWin = false;
+var lastPlayerHit = false;
+var lastBossHit = false;
+var playerInvulnTicks = 0;
+// Start music
+LK.playMusic('bossMusic');
+// --- UI ---
+scoreText = new Text2('Score: 0', {
+	size: 90,
+	fill: 0xFFFFFF
+});
+scoreText.anchor.set(0.5, 0);
+LK.gui.top.addChild(scoreText);
+levelText = new Text2('Level 1', {
+	size: 70,
+	fill: 0xFFE066
+});
+levelText.anchor.set(0.5, 0);
+LK.gui.top.addChild(levelText);
+levelText.y = 110;
+// Boss HP bar
+bossHpBarBg = LK.getAsset('bossHpBarBg', {
+	anchorX: 0.5,
+	anchorY: 0.5,
+	x: 2048 / 2,
+	y: 320
+});
+bossHpBar = LK.getAsset('bossHpBar', {
+	anchorX: 0,
+	anchorY: 0.5,
+	x: 2048 / 2 - 400,
+	y: 320
+});
+bossHpText = new Text2('', {
+	size: 60,
+	fill: 0xFFFFFF
+});
+bossHpText.anchor.set(0.5, 0.5);
+bossHpText.x = 2048 / 2;
+bossHpText.y = 320;
+game.addChild(bossHpBarBg);
+game.addChild(bossHpBar);
+game.addChild(bossHpText);
+// --- Player ---
+player = new Player();
+player.x = 2048 / 2;
+player.y = 2732 - 320;
+game.addChild(player);
+// --- Boss ---
+function spawnBoss(level) {
+	if (boss) {
+		boss.destroy();
+	}
+	boss = new Boss();
+	boss.maxHp = 10 + (level - 1) * 8;
+	boss.hp = boss.maxHp;
+	boss.x = 2048 / 2;
+	boss.y = 600;
+	boss.moveSpeed = 6 + Math.floor(level / 2);
+	boss.patternType = (level - 1) % 3;
+	boss.shootCooldown = 0;
+	boss.patternTick = 0;
+	game.addChild(boss);
+	updateBossHpBar();
+}
+spawnBoss(currentLevel);
+// --- Helper functions ---
+function updateBossHpBar() {
+	var hpRatio = boss.hp / boss.maxHp;
+	bossHpBar.width = 800 * hpRatio;
+	bossHpText.setText('Boss HP: ' + boss.hp + ' / ' + boss.maxHp);
+}
+function resetGameState() {
+	// Remove all bullets
+	for (var i = 0; i < playerBullets.length; i++) {
+		playerBullets[i].destroy();
+	}
+	for (var i = 0; i < bossBullets.length; i++) {
+		bossBullets[i].destroy();
+	}
+	playerBullets = [];
+	bossBullets = [];
+	player.x = 2048 / 2;
+	player.y = 2732 - 320;
+	playerInvulnTicks = 0;
+	lastPlayerHit = false;
+	lastBossHit = false;
+	isGameOver = false;
+	isYouWin = false;
+	canShoot = true;
+	LK.setScore(0);
+	scoreText.setText('Score: 0');
+	currentLevel = 1;
+	levelText.setText('Level 1');
+	spawnBoss(currentLevel);
+}
+// --- Shooting ---
+function shootPlayerBullet() {
+	if (!canShoot || isGameOver || isYouWin) return;
+	if (player.cooldown > 0) return;
+	var bullet = new PlayerBullet();
+	bullet.x = player.x;
+	bullet.y = player.y - 100;
+	playerBullets.push(bullet);
+	game.addChild(bullet);
+	player.cooldown = 10;
+	LK.getSound('playerShoot').play();
+}
+function shootBossBullets() {
+	if (!boss) return;
+	var pattern = boss.patternType;
+	var tick = boss.patternTick;
+	var level = currentLevel;
+	// Patterns: 0 = straight, 1 = spread, 2 = aimed
+	if (pattern === 0) {
+		// Straight down, faster at higher levels
+		if (tick % Math.max(40 - level * 2, 12) === 0) {
+			var bullet = new BossBullet();
+			bullet.x = boss.x;
+			bullet.y = boss.y + 120;
+			bullet.speedY = 18 + level * 1.5;
+			bullet.speedX = 0;
+			bossBullets.push(bullet);
+			game.addChild(bullet);
+			LK.getSound('bossShoot').play();
+		}
+	} else if (pattern === 1) {
+		// Spread: 3 bullets
+		if (tick % Math.max(60 - level * 2, 18) === 0) {
+			for (var i = -1; i <= 1; i++) {
+				var bullet = new BossBullet();
+				bullet.x = boss.x;
+				bullet.y = boss.y + 120;
+				bullet.speedY = 16 + level * 1.2;
+				bullet.speedX = i * (6 + level * 0.7);
+				bossBullets.push(bullet);
+				game.addChild(bullet);
+			}
+			LK.getSound('bossShoot').play();
+		}
+	} else if (pattern === 2) {
+		// Aimed at player
+		if (tick % Math.max(50 - level * 2, 14) === 0) {
+			var dx = player.x - boss.x;
+			var dy = player.y - boss.y;
+			var mag = Math.sqrt(dx * dx + dy * dy);
+			var speed = 20 + level * 1.5;
+			var bullet = new BossBullet();
+			bullet.x = boss.x;
+			bullet.y = boss.y + 120;
+			bullet.speedX = dx / mag * speed;
+			bullet.speedY = dy / mag * speed;
+			bossBullets.push(bullet);
+			game.addChild(bullet);
+			LK.getSound('bossShoot').play();
+		}
+	}
+}
+// --- Game events ---
+// Tap anywhere to shoot
+game.down = function (x, y, obj) {
+	shootPlayerBullet();
+};
+// No drag/move for player (player is stationary)
+// --- Main update loop ---
+game.update = function () {
+	if (isGameOver || isYouWin) return;
+	// Player cooldown
+	if (player.cooldown > 0) player.cooldown--;
+	// Player invulnerability after hit
+	if (playerInvulnTicks > 0) {
+		playerInvulnTicks--;
+		if (playerInvulnTicks % 6 < 3) {
+			player.alpha = 0.4;
+		} else {
+			player.alpha = 1;
+		}
+	} else {
+		player.alpha = 1;
+	}
+	// Update boss
+	if (boss) boss.update();
+	// Boss shooting
+	if (boss) shootBossBullets();
+	// Update player bullets
+	for (var i = playerBullets.length - 1; i >= 0; i--) {
+		var b = playerBullets[i];
+		b.update();
+		// Off screen
+		if (b.y < -100) {
+			b.destroy();
+			playerBullets.splice(i, 1);
+			continue;
+		}
+		// Hit boss
+		if (boss && b.intersects(boss)) {
+			boss.hp -= 1;
+			LK.getSound('bossHit').play();
+			tween(boss, {
+				scaleX: 1.2,
+				scaleY: 1.2
+			}, {
+				duration: 80,
+				easing: tween.easeOut,
+				onFinish: function onFinish() {
+					tween(boss, {
+						scaleX: 1,
+						scaleY: 1
+					}, {
+						duration: 80
+					});
+				}
+			});
+			updateBossHpBar();
+			b.destroy();
+			playerBullets.splice(i, 1);
+			LK.setScore(LK.getScore() + 1);
+			scoreText.setText('Score: ' + LK.getScore());
+			// Boss defeated
+			if (boss.hp <= 0) {
+				LK.getSound('bossDefeat').play();
+				tween(boss, {
+					alpha: 0
+				}, {
+					duration: 400,
+					onFinish: function onFinish() {
+						boss.destroy();
+					}
+				});
+				if (currentLevel < maxLevel) {
+					currentLevel++;
+					levelText.setText('Level ' + currentLevel);
+					LK.setTimeout(function () {
+						spawnBoss(currentLevel);
+					}, 900);
+				} else {
+					// Win
+					isYouWin = true;
+					LK.showYouWin();
+				}
+			}
+		}
+	}
+	// Update boss bullets
+	for (var i = bossBullets.length - 1; i >= 0; i--) {
+		var b = bossBullets[i];
+		b.update();
+		// Off screen
+		if (b.y > 2732 + 100 || b.x < -100 || b.x > 2048 + 100) {
+			b.destroy();
+			bossBullets.splice(i, 1);
+			continue;
+		}
+		// Hit player
+		if (playerInvulnTicks === 0 && b.intersects(player)) {
+			LK.getSound('playerHit').play();
+			tween(player, {
+				scaleX: 1.3,
+				scaleY: 1.3
+			}, {
+				duration: 80,
+				easing: tween.easeOut,
+				onFinish: function onFinish() {
+					tween(player, {
+						scaleX: 1,
+						scaleY: 1
+					}, {
+						duration: 80
+					});
+				}
+			});
+			playerInvulnTicks = 60;
+			// Game over
+			LK.effects.flashScreen(0xff0000, 800);
+			isGameOver = true;
+			LK.setTimeout(function () {
+				LK.showGameOver();
+			}, 900);
+		}
+	}
+};
+// Reset game state on game over or win
+LK.on('gameover', function () {
+	resetGameState();
+});
+LK.on('youwin', function () {
+	resetGameState();
 });
\ No newline at end of file