===================================================================
--- original.js
+++ change.js
@@ -1,6 +1,365 @@
-/****
+/**** 
+* Plugins
+****/ 
+var tween = LK.import("@upit/tween.v1");
+
+/**** 
+* Classes
+****/ 
+var Dragon = Container.expand(function () {
+	var self = Container.call(this);
+	var dragonGraphics = self.attachAsset('dragon', {
+		anchorX: 0.5,
+		anchorY: 0.5
+	});
+	self.health = 50;
+	self.maxHealth = 50;
+	self.speed = 2;
+	self.shootTimer = 0;
+	self.moveDirection = 1;
+	self.phase = 1;
+	self.update = function () {
+		self.x += self.moveDirection * self.speed;
+		if (self.x < 200 || self.x > 1848) {
+			self.moveDirection *= -1;
+		}
+		self.shootTimer++;
+		if (self.phase == 1 && self.shootTimer >= 40) {
+			self.shootTimer = 0;
+			for (var i = -1; i <= 1; i++) {
+				var bullet = new DragonBullet();
+				bullet.x = self.x + i * 80;
+				bullet.y = self.y + 100;
+				bullet.direction = i;
+				dragonBullets.push(bullet);
+				game.addChild(bullet);
+			}
+		} else if (self.phase == 2 && self.shootTimer >= 25) {
+			self.shootTimer = 0;
+			for (var i = -2; i <= 2; i++) {
+				var bullet = new DragonBullet();
+				bullet.x = self.x + i * 60;
+				bullet.y = self.y + 100;
+				bullet.direction = i * 0.5;
+				dragonBullets.push(bullet);
+				game.addChild(bullet);
+			}
+		}
+		if (self.health < self.maxHealth * 0.5 && self.phase == 1) {
+			self.phase = 2;
+			self.speed = 3;
+			dragonGraphics.tint = 0xff6666;
+		}
+	};
+	self.takeDamage = function () {
+		self.health--;
+		LK.effects.flashObject(self, 0xff0000, 200);
+		if (self.health <= 0) {
+			LK.getSound('explosion').play();
+			return true;
+		}
+		LK.getSound('hit').play();
+		return false;
+	};
+	return self;
+});
+var DragonBullet = Container.expand(function () {
+	var self = Container.call(this);
+	var bulletGraphics = self.attachAsset('dragonBullet', {
+		anchorX: 0.5,
+		anchorY: 0.5
+	});
+	self.speed = 6;
+	self.direction = 1;
+	self.update = function () {
+		self.y += self.speed;
+		self.x += self.direction * 2;
+	};
+	return self;
+});
+var Enemy = Container.expand(function () {
+	var self = Container.call(this);
+	var enemyGraphics = self.attachAsset('enemy', {
+		anchorX: 0.5,
+		anchorY: 0.5
+	});
+	self.speed = 3;
+	self.shootTimer = 0;
+	self.moveDirection = 1;
+	self.update = function () {
+		self.y += self.speed;
+		self.x += self.moveDirection * 1.5;
+		if (self.x < 100 || self.x > 1948) {
+			self.moveDirection *= -1;
+		}
+		self.shootTimer++;
+		if (self.shootTimer >= 60 && Math.random() < 0.02) {
+			self.shootTimer = 0;
+			var bullet = new EnemyBullet();
+			bullet.x = self.x;
+			bullet.y = self.y + 50;
+			enemyBullets.push(bullet);
+			game.addChild(bullet);
+		}
+	};
+	return self;
+});
+var EnemyBullet = Container.expand(function () {
+	var self = Container.call(this);
+	var bulletGraphics = self.attachAsset('enemyBullet', {
+		anchorX: 0.5,
+		anchorY: 0.5
+	});
+	self.speed = 8;
+	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: 0.5
+	});
+	self.health = 3;
+	self.shootTimer = 0;
+	self.invulnerable = 0;
+	self.update = function () {
+		if (self.invulnerable > 0) {
+			self.invulnerable--;
+			playerGraphics.alpha = self.invulnerable % 10 < 5 ? 0.5 : 1.0;
+		} else {
+			playerGraphics.alpha = 1.0;
+		}
+		self.shootTimer++;
+		if (self.shootTimer >= 15) {
+			self.shootTimer = 0;
+			var bullet = new PlayerBullet();
+			bullet.x = self.x;
+			bullet.y = self.y - 60;
+			playerBullets.push(bullet);
+			game.addChild(bullet);
+			LK.getSound('shoot').play();
+		}
+	};
+	self.takeDamage = function () {
+		if (self.invulnerable <= 0) {
+			self.health--;
+			self.invulnerable = 120;
+			LK.effects.flashObject(self, 0xff0000, 500);
+			LK.getSound('hit').play();
+			return true;
+		}
+		return false;
+	};
+	return self;
+});
+var PlayerBullet = Container.expand(function () {
+	var self = Container.call(this);
+	var bulletGraphics = self.attachAsset('playerBullet', {
+		anchorX: 0.5,
+		anchorY: 0.5
+	});
+	self.speed = -12;
+	self.update = function () {
+		self.y += self.speed;
+	};
+	return self;
+});
+
+/**** 
 * Initialize Game
-****/
+****/ 
 var game = new LK.Game({
-	backgroundColor: 0x000000
-});
\ No newline at end of file
+	backgroundColor: 0x1976D2
+});
+
+/**** 
+* Game Code
+****/ 
+var player = null;
+var enemies = [];
+var dragon = null;
+var playerBullets = [];
+var enemyBullets = [];
+var dragonBullets = [];
+var currentLevel = 1;
+var enemiesKilled = 0;
+var enemiesNeeded = 0;
+var levelComplete = false;
+var dragNode = null;
+var levelText = new Text2('Level 1', {
+	size: 100,
+	fill: 0xFFFFFF
+});
+levelText.anchor.set(0.5, 0);
+LK.gui.top.addChild(levelText);
+var scoreText = new Text2('Score: 0', {
+	size: 60,
+	fill: 0xFFFFFF
+});
+scoreText.anchor.set(1, 0);
+scoreText.x = -20;
+scoreText.y = 20;
+LK.gui.topRight.addChild(scoreText);
+var healthText = new Text2('Health: 3', {
+	size: 60,
+	fill: 0xFFFFFF
+});
+healthText.anchor.set(0, 0);
+healthText.x = 120;
+healthText.y = 20;
+LK.gui.topLeft.addChild(healthText);
+function startLevel(level) {
+	currentLevel = level;
+	enemiesKilled = 0;
+	levelComplete = false;
+	levelText.setText('Level ' + level);
+	enemies = [];
+	dragon = null;
+	if (level < 7) {
+		enemiesNeeded = 5 + level * 2;
+		for (var i = 0; i < Math.min(3 + level, 8); i++) {
+			spawnEnemy();
+		}
+	} else {
+		dragon = new Dragon();
+		dragon.x = 1024;
+		dragon.y = 300;
+		game.addChild(dragon);
+	}
+}
+function spawnEnemy() {
+	var enemy = new Enemy();
+	enemy.x = Math.random() * 1600 + 224;
+	enemy.y = Math.random() * -500 - 100;
+	enemy.speed = 2 + currentLevel * 0.5;
+	enemies.push(enemy);
+	game.addChild(enemy);
+}
+function handleMove(x, y, obj) {
+	if (dragNode && player) {
+		dragNode.x = Math.max(50, Math.min(1998, x));
+		dragNode.y = Math.max(200, Math.min(2600, y));
+	}
+}
+player = new Player();
+player.x = 1024;
+player.y = 2400;
+game.addChild(player);
+startLevel(1);
+game.move = handleMove;
+game.down = function (x, y, obj) {
+	dragNode = player;
+	handleMove(x, y, obj);
+};
+game.up = function (x, y, obj) {
+	dragNode = null;
+};
+game.update = function () {
+	scoreText.setText('Score: ' + LK.getScore());
+	healthText.setText('Health: ' + (player ? player.health : 0));
+	if (!player || player.health <= 0) {
+		LK.showGameOver();
+		return;
+	}
+	// Player bullets vs enemies
+	for (var i = playerBullets.length - 1; i >= 0; i--) {
+		var bullet = playerBullets[i];
+		if (bullet.y < -50) {
+			bullet.destroy();
+			playerBullets.splice(i, 1);
+			continue;
+		}
+		var hit = false;
+		for (var j = enemies.length - 1; j >= 0; j--) {
+			var enemy = enemies[j];
+			if (bullet.intersects(enemy)) {
+				LK.setScore(LK.getScore() + 100);
+				bullet.destroy();
+				playerBullets.splice(i, 1);
+				enemy.destroy();
+				enemies.splice(j, 1);
+				enemiesKilled++;
+				hit = true;
+				break;
+			}
+		}
+		if (!hit && dragon && bullet.intersects(dragon)) {
+			LK.setScore(LK.getScore() + 50);
+			bullet.destroy();
+			playerBullets.splice(i, 1);
+			if (dragon.takeDamage()) {
+				dragon.destroy();
+				dragon = null;
+				LK.setScore(LK.getScore() + 5000);
+				LK.showYouWin();
+				return;
+			}
+		}
+	}
+	// Enemy bullets vs player
+	for (var i = enemyBullets.length - 1; i >= 0; i--) {
+		var bullet = enemyBullets[i];
+		if (bullet.y > 2782) {
+			bullet.destroy();
+			enemyBullets.splice(i, 1);
+			continue;
+		}
+		if (bullet.intersects(player)) {
+			bullet.destroy();
+			enemyBullets.splice(i, 1);
+			player.takeDamage();
+		}
+	}
+	// Dragon bullets vs player
+	for (var i = dragonBullets.length - 1; i >= 0; i--) {
+		var bullet = dragonBullets[i];
+		if (bullet.y > 2782 || bullet.x < -50 || bullet.x > 2098) {
+			bullet.destroy();
+			dragonBullets.splice(i, 1);
+			continue;
+		}
+		if (bullet.intersects(player)) {
+			bullet.destroy();
+			dragonBullets.splice(i, 1);
+			player.takeDamage();
+		}
+	}
+	// Player vs enemies collision
+	for (var i = enemies.length - 1; i >= 0; i--) {
+		var enemy = enemies[i];
+		if (enemy.y > 2782) {
+			enemy.destroy();
+			enemies.splice(i, 1);
+			continue;
+		}
+		if (enemy.intersects(player)) {
+			enemy.destroy();
+			enemies.splice(i, 1);
+			player.takeDamage();
+		}
+	}
+	// Player vs dragon collision
+	if (dragon && dragon.intersects(player)) {
+		player.takeDamage();
+	}
+	// Level progression
+	if (currentLevel < 7) {
+		if (enemiesKilled >= enemiesNeeded) {
+			if (!levelComplete) {
+				levelComplete = true;
+				LK.setTimeout(function () {
+					if (currentLevel < 6) {
+						startLevel(currentLevel + 1);
+					} else {
+						startLevel(7);
+					}
+				}, 2000);
+			}
+		} else if (enemies.length < 2 && enemiesKilled < enemiesNeeded) {
+			spawnEnemy();
+		}
+	}
+};
\ No newline at end of file