/**** 
* Plugins
****/ 
var tween = LK.import("@upit/tween.v1");

/**** 
* Classes
****/ 
// Alien class
var Alien = Container.expand(function () {
	var self = Container.call(this);
	var alienAsset = self.attachAsset('alien', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.width = alienAsset.width;
	self.height = alienAsset.height;
	self.hp = 2; // Each alien takes 2 hits
	self.isHit = false;
	self.hitTween = null;
	// For hit flash
	self.flash = function () {
		if (self.hitTween) {
			tween.stop(alienAsset, {
				tint: true
			});
		}
		alienAsset.tint = 0xff5252;
		self.hitTween = tween(alienAsset, {
			tint: 0x8d3abf
		}, {
			duration: 200,
			easing: tween.linear,
			onFinish: function onFinish() {
				self.hitTween = null;
			}
		});
	};
	// For movement
	self.speed = 8 + Math.random() * 4; // Slightly random speed
	self.update = function () {
		self.y += self.speed;
	};
	return self;
});
// Boss Alien class (for level 7)
var BossAlien = Container.expand(function () {
	var self = Container.call(this);
	var bossAsset = self.attachAsset('alien', {
		anchorX: 0.5,
		anchorY: 0.5,
		scaleX: 1.7,
		scaleY: 1.7
	});
	self.width = bossAsset.width * 1.7;
	self.height = bossAsset.height * 1.7;
	self.hp = 6; // Boss takes 6 hits
	self.isHit = false;
	self.hitTween = null;
	self.flash = function () {
		if (self.hitTween) {
			tween.stop(bossAsset, {
				tint: true
			});
		}
		bossAsset.tint = 0xff5252;
		self.hitTween = tween(bossAsset, {
			tint: 0x8d3abf
		}, {
			duration: 200,
			easing: tween.linear,
			onFinish: function onFinish() {
				self.hitTween = null;
			}
		});
	};
	self.speed = 10; // Boss is faster
	self.update = function () {
		self.y += self.speed;
	};
	return self;
});
// Bullet class
var Bullet = Container.expand(function () {
	var self = Container.call(this);
	var bulletAsset = self.attachAsset('bullet', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.speed = -32; // Upwards
	self.update = function () {
		self.y += self.speed;
	};
	return self;
});
// Rocket (player) class
var Rocket = Container.expand(function () {
	var self = Container.call(this);
	var rocketAsset = self.attachAsset('rocket', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.width = rocketAsset.width;
	self.height = rocketAsset.height;
	// For hit flash
	self.flashTween = null;
	// Show hit flash
	self.flash = function () {
		if (self.flashTween) {
			tween.stop(rocketAsset, {
				tint: true
			});
		}
		rocketAsset.tint = 0xff5252;
		self.flashTween = tween(rocketAsset, {
			tint: 0x4fc3f7
		}, {
			duration: 400,
			easing: tween.linear,
			onFinish: function onFinish() {
				self.flashTween = null;
			}
		});
	};
	return self;
});

/**** 
* Initialize Game
****/ 
var game = new LK.Game({
	backgroundColor: 0x000000
});

/**** 
* Game Code
****/ 
// Life bar background
// Life bar
// Alien hit flash
// Bullet
// Alien (enemy)
// Rocket (player)
// Game constants
var GAME_WIDTH = 2048;
var GAME_HEIGHT = 2732;
var ROCKET_START_LIFE = 3;
var LEVEL_TO_BOSS = 7;
// Game state
var rocket = null;
var bullets = [];
var aliens = [];
var level = 1;
var rocketLife = ROCKET_START_LIFE;
var canShoot = true;
var shootCooldown = 0;
var dragNode = null;
var lastMoveX = 0;
var lastMoveY = 0;
var score = 0;
var bossSpawned = false;
// GUI elements
var scoreTxt = new Text2('0', {
	size: 90,
	fill: "#fff"
});
scoreTxt.anchor.set(0.5, 0);
LK.gui.topRight.addChild(scoreTxt);
var lifeBarBg = LK.getAsset('lifeBarBg', {
	anchorX: 0.5,
	anchorY: 0.5,
	x: 0,
	y: 0
});
var lifeBar = LK.getAsset('lifeBar', {
	anchorX: 0,
	anchorY: 0.5,
	x: -200,
	y: 0
});
var lifeBarContainer = new Container();
lifeBarContainer.addChild(lifeBarBg);
lifeBarContainer.addChild(lifeBar);
lifeBarContainer.x = GAME_WIDTH / 2;
lifeBarContainer.y = 180;
LK.gui.top.addChild(lifeBarContainer);
// Level bar background and bar
// Centered level bar (not full width)
var LEVEL_BAR_WIDTH = 900;
var levelBarBg = LK.getAsset('lifeBarBg', {
	anchorX: 0.5,
	anchorY: 0.5,
	x: 0,
	y: 0,
	width: LEVEL_BAR_WIDTH
});
var levelBar = LK.getAsset('lifeBar', {
	anchorX: 0,
	anchorY: 0.5,
	x: -LEVEL_BAR_WIDTH / 2,
	y: 0,
	width: 0 // Start empty, will be set by updateLevelBar
});
levelBar.tint = 0x1976d2; // blue for level bar
var levelBarContainer = new Container();
levelBarContainer.addChild(levelBarBg);
levelBarContainer.addChild(levelBar);
levelBarContainer.x = rocket.x;
levelBarContainer.y = 240; // below the life bar
LK.gui.top.addChild(levelBarContainer);
// Helper to update life bar
function updateLifeBar() {
	var percent = rocketLife / ROCKET_START_LIFE;
	if (percent < 0) percent = 0;
	lifeBar.width = 400 * percent;
	if (percent > 0.5) {
		lifeBar.tint = 0x43a047;
	} else if (percent > 0.2) {
		lifeBar.tint = 0xffc107;
	} else {
		lifeBar.tint = 0xd32f2f;
	}
}
// Helper to update level bar
function updateLevelBar() {
	// Level progress: 0 to 1, based on kills in this level
	var killsThisLevel = score % 10;
	var percent = killsThisLevel / 10;
	if (percent < 0) percent = 0;
	if (percent > 1) percent = 1;
	levelBar.width = LEVEL_BAR_WIDTH * percent;
	// Color: blue if not full, green if full
	if (percent >= 1) {
		levelBar.tint = 0x43a047;
	} else {
		levelBar.tint = 0x1976d2;
	}
}
// Helper to update level text (removed levelTxt, now only bar)
function updateLevelText() {
	// No text, only bar
}
// Helper to update score text
function updateScoreText() {
	scoreTxt.setText(score);
	updateLevelBar();
}
// Spawn a new alien
function spawnAlien() {
	var alien;
	if (level === LEVEL_TO_BOSS && !bossSpawned) {
		alien = new BossAlien();
		bossSpawned = true;
	} else {
		alien = new Alien();
	}
	// Random x, but keep inside screen
	var margin = 120;
	alien.x = margin + Math.random() * (GAME_WIDTH - margin * 2);
	alien.y = -alien.height / 2;
	aliens.push(alien);
	game.addChild(alien);
}
// Reset game state
function resetGame() {
	// Remove all bullets and aliens
	for (var i = 0; i < bullets.length; ++i) {
		bullets[i].destroy();
	}
	for (var j = 0; j < aliens.length; ++j) {
		aliens[j].destroy();
	}
	bullets = [];
	aliens = [];
	level = 1;
	rocketLife = ROCKET_START_LIFE;
	canShoot = true;
	shootCooldown = 0;
	dragNode = null;
	lastMoveX = 0;
	lastMoveY = 0;
	score = 0;
	bossSpawned = false;
	updateLevelText();
	updateScoreText();
	updateLifeBar();
	updateLevelBar();
}
// Initialize rocket
rocket = new Rocket();
rocket.x = GAME_WIDTH / 2;
rocket.y = GAME_HEIGHT - 400;
game.addChild(rocket);
// Initial GUI
updateLevelText();
updateScoreText();
updateLifeBar();
updateLevelBar();
// Touch/move controls
game.down = function (x, y, obj) {
	// Only start drag if touch is on rocket
	var local = rocket.toLocal(game.toGlobal({
		x: x,
		y: y
	}));
	if (local.x > -rocket.width / 2 && local.x < rocket.width / 2 && local.y > -rocket.height / 2 && local.y < rocket.height / 2) {
		dragNode = rocket;
		lastMoveX = x;
		lastMoveY = y;
	}
};
game.move = function (x, y, obj) {
	// Always move the rocket to the mouse/touch position, clamped to screen
	var newX = x;
	var halfW = rocket.width / 2;
	if (newX < halfW) newX = halfW;
	if (newX > GAME_WIDTH - halfW) newX = GAME_WIDTH - halfW;
	rocket.x = newX;
	// Y position stays fixed at the starting Y
	rocket.y = GAME_HEIGHT - 400;
	lastMoveX = x;
	lastMoveY = y;
};
game.up = function (x, y, obj) {
	dragNode = null;
};
// Tap to shoot (left mouse button or tap)
game.down = function (x, y, obj) {
	// Only start drag if touch is on rocket
	var local = rocket.toLocal(game.toGlobal({
		x: x,
		y: y
	}));
	if (local.x > -rocket.width / 2 && local.x < rocket.width / 2 && local.y > -rocket.height / 2 && local.y < rocket.height / 2) {
		dragNode = rocket;
		lastMoveX = x;
		lastMoveY = y;
	}
	// Always allow shooting with left mouse button/tap, regardless of drag state
	if (canShoot) {
		shootBullet();
	}
};
// Shoot bullet
function shootBullet() {
	if (!canShoot) return;
	var bullet = new Bullet();
	bullet.x = rocket.x;
	bullet.y = rocket.y - rocket.height / 2 - 20;
	bullets.push(bullet);
	game.addChild(bullet);
	canShoot = false;
	shootCooldown = 10; // 10 ticks cooldown
}
// Main update loop
game.update = function () {
	// Shooting cooldown
	if (!canShoot) {
		shootCooldown--;
		if (shootCooldown <= 0) {
			canShoot = true;
		}
	}
	// Make level bar follow rocket's X position
	if (typeof rocket !== "undefined" && rocket !== null && typeof levelBarContainer !== "undefined" && levelBarContainer !== null && typeof rocket.x !== "undefined" && rocket.x !== null) {
		levelBarContainer.x = rocket.x;
	}
	// Update bullets
	for (var i = bullets.length - 1; i >= 0; --i) {
		var b = bullets[i];
		b.update();
		// Remove if off screen
		if (b.y < -100) {
			b.destroy();
			bullets.splice(i, 1);
			continue;
		}
	}
	// Update aliens
	for (var j = aliens.length - 1; j >= 0; --j) {
		var a = aliens[j];
		a.update();
		// Remove if off screen
		if (a.y > GAME_HEIGHT + 200) {
			a.destroy();
			aliens.splice(j, 1);
			continue;
		}
		// Check collision with rocket
		if (a.intersects(rocket)) {
			// Rocket hit!
			rocketLife--;
			updateLifeBar();
			rocket.flash();
			a.flash();
			if (a.hp > 1) {
				a.hp--;
				// Alien stays, but flashes
			} else {
				a.destroy();
				aliens.splice(j, 1);
				score++;
				updateScoreText();
				// Increase level every 10 kills
				if (level < LEVEL_TO_BOSS && score % 10 === 0) {
					level++;
					updateLevelText();
				}
			}
			// Check for game over
			if (rocketLife <= 0) {
				LK.effects.flashScreen(0xff0000, 1000);
				LK.showGameOver();
				return;
			}
		}
	}
	// Bullet-alien collisions
	for (var i2 = bullets.length - 1; i2 >= 0; --i2) {
		var b2 = bullets[i2];
		for (var j2 = aliens.length - 1; j2 >= 0; --j2) {
			var a2 = aliens[j2];
			if (b2.intersects(a2)) {
				a2.hp--;
				a2.flash();
				b2.destroy();
				bullets.splice(i2, 1);
				if (a2.hp <= 0) {
					a2.destroy();
					aliens.splice(j2, 1);
					score++;
					updateScoreText();
					// Increase level every 10 kills
					if (level < LEVEL_TO_BOSS && score % 10 === 0) {
						level++;
						updateLevelText();
					}
					// If boss defeated, win
					if (level === LEVEL_TO_BOSS && bossSpawned && aliens.length === 0) {
						LK.effects.flashScreen(0x00e676, 1000);
						LK.showYouWin();
						return;
					}
				}
				break;
			}
		}
	}
	// Alien spawn logic
	if (level < LEVEL_TO_BOSS) {
		// Spawn aliens at interval, max 2 on screen
		if (aliens.length < 2 && LK.ticks % (60 - level * 4) === 0) {
			spawnAlien();
		}
	} else if (level === LEVEL_TO_BOSS && !bossSpawned) {
		// Spawn boss
		spawnAlien();
	}
};
// Initial spawn
spawnAlien();

===================================================================
--- original.js
+++ change.js
@@ -361,9 +361,9 @@
 			canShoot = true;
 		}
 	}
 	// Make level bar follow rocket's X position
-	if (typeof rocket !== "undefined" && rocket !== null && typeof levelBarContainer !== "undefined" && levelBarContainer !== null) {
+	if (typeof rocket !== "undefined" && rocket !== null && typeof levelBarContainer !== "undefined" && levelBarContainer !== null && typeof rocket.x !== "undefined" && rocket.x !== null) {
 		levelBarContainer.x = rocket.x;
 	}
 	// Update bullets
 	for (var i = bullets.length - 1; i >= 0; --i) {