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

/**** 
* Classes
****/ 
// Boss enemy class
var Boss = Container.expand(function (difficulty) {
	var self = Container.call(this);
	var bossSprite = self.attachAsset('mutant', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	// Make boss visually distinct: scale up, tint, etc.
	bossSprite.scaleX = 3.2;
	bossSprite.scaleY = 3.2;
	bossSprite.tint = 0x8e24aa; // purple
	self.radius = bossSprite.width * 1.6;
	// Difficulty scaling
	var diff = typeof difficulty === "number" ? difficulty : 1;
	self.speed = 0.4 + diff * 0.05; // Easier: boss is slower, less scaling
	self.shootTimer = 36 + Math.floor(Math.random() * 30);
	self.hp = 32 + diff * 5; // Easier: boss HP scales less
	// Called every tick
	self.update = function () {
		self.y += self.speed;
		self.shootTimer--;
		if (self.shootTimer <= 0) {
			// If boss HP is below half, alternate between spread and ring attacks
			if (self.hp <= (32 + diff * 8) / 2 && Math.random() < 0.5) {
				self.shootRing(diff);
			} else {
				self.shoot(diff);
			}
			// Boss shoots more often as difficulty increases
			var minShoot = Math.max(24, 60 - diff * 4);
			var maxShoot = Math.max(36, 100 - diff * 6);
			self.shootTimer = minShoot + Math.floor(Math.random() * (maxShoot - minShoot));
		}
	};
	// Boss fires a spread of bullets downward (classic spread attack)
	self.shoot = function (diff) {
		var numBullets = 9 + Math.floor(diff / 2); // More bullets at higher difficulty
		var spread = Math.PI * (0.7 + diff * 0.08); // wider spread as difficulty increases
		var baseAngle = Math.PI / 2; // Downwards
		for (var i = 0; i < numBullets; i++) {
			var angle = baseAngle - spread / 2 + spread / (numBullets - 1) * i;
			var bullet = new MutantBullet();
			bullet.x = self.x;
			bullet.y = self.y + self.radius;
			bullet.speedX = Math.cos(angle) * (15 + diff * 0.7);
			bullet.speed = Math.sin(angle) * (15 + diff * 0.7);
			mutantBullets.push(bullet);
			game.addChild(bullet);
		}
		LK.getSound('mutantShoot').play();
	};
	// Boss fires a ring of bullets in all directions (harder pattern)
	self.shootRing = function (diff) {
		var numBullets = 16 + Math.floor(diff * 1.5); // More bullets in ring as difficulty increases
		var baseAngle = Math.random() * Math.PI * 2; // randomize ring rotation
		for (var i = 0; i < numBullets; i++) {
			var angle = baseAngle + Math.PI * 2 / numBullets * i;
			var bullet = new MutantBullet();
			bullet.x = self.x;
			bullet.y = self.y + self.radius * 0.7;
			bullet.speedX = Math.cos(angle) * (10 + diff * 0.5);
			bullet.speed = Math.sin(angle) * (10 + diff * 0.5);
			mutantBullets.push(bullet);
			game.addChild(bullet);
		}
		LK.getSound('mutantShoot').play();
	};
	// Take damage
	self.hit = function () {
		self.hp--;
		LK.getSound('mutantHit').play();
		LK.effects.flashObject(self, 0xffffff, 150);
		if (self.hp <= 0) {
			self.destroy();
			// Allow further mutant spawning after boss dies
			bossSpawned = false;
			return true;
		}
		return false;
	};
	return self;
});
// Hero class
var Hero = Container.expand(function () {
	var self = Container.call(this);
	var heroSprite = self.attachAsset('hero', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.radius = heroSprite.width * 0.5;
	self.shootCooldown = 0; // ticks until next shot allowed
	// Called every tick
	self.update = function () {
		if (self.shootCooldown > 0) {
			self.shootCooldown--;
		}
	};
	// Shoot a bullet upwards
	self.shoot = function () {
		if (self.shootCooldown === 0) {
			var bullet = new HeroBullet();
			bullet.x = self.x;
			bullet.y = self.y - self.radius - bullet.height * 0.5;
			heroBullets.push(bullet);
			game.addChild(bullet);
			LK.getSound('heroShoot').play();
			self.shootCooldown = 12; // 12 ticks cooldown (~0.2s)
		}
	};
	return self;
});
// Hero bullet class
var HeroBullet = Container.expand(function () {
	var self = Container.call(this);
	var bulletSprite = self.attachAsset('heroBullet', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.width = bulletSprite.width;
	self.height = bulletSprite.height;
	self.speed = -22;
	self.update = function () {
		self.y += self.speed;
	};
	return self;
});
// Mutant enemy class
var Mutant = Container.expand(function (difficulty) {
	var self = Container.call(this);
	var mutantSprite = self.attachAsset('mutant', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.radius = mutantSprite.width * 0.5;
	// Difficulty scaling
	var diff = typeof difficulty === "number" ? difficulty : 1;
	// Mutants are always fast, but their attack pattern does not scale with difficulty
	self.speed = 5 + Math.random() * 2; // Fast mutants, fixed speed
	self.shootTimer = 60 + Math.floor(Math.random() * 60); // Randomize first shot
	self.hp = 2; // Fixed HP for easier gameplay
	// Called every tick
	self.update = function () {
		self.y += self.speed;
		self.shootTimer--;
		if (self.shootTimer <= 0) {
			self.shoot(diff);
			// Mutants shoot more often as difficulty increases
			var minShoot = Math.max(30, 90 - diff * 8);
			var maxShoot = Math.max(50, 150 - diff * 10);
			self.shootTimer = minShoot + Math.floor(Math.random() * (maxShoot - minShoot));
		}
	};
	// Shoot a bullet downwards, with difficulty-based spread
	self.shoot = function (diff) {
		var numBullets = 1; // Always 1 bullet, no scaling
		var spread = 0; // No spread
		var baseAngle = Math.PI / 2; // Downwards
		for (var i = 0; i < numBullets; i++) {
			var angle = baseAngle;
			var bullet = new MutantBullet();
			bullet.x = self.x;
			bullet.y = self.y + self.radius + bullet.height * 0.5;
			bullet.speedX = 0;
			bullet.speed = 14; // Fixed bullet speed
			mutantBullets.push(bullet);
			game.addChild(bullet);
		}
		LK.getSound('mutantShoot').play();
	};
	// Take damage
	self.hit = function () {
		self.hp--;
		LK.getSound('mutantHit').play();
		LK.effects.flashObject(self, 0xffffff, 150);
		if (self.hp <= 0) {
			self.destroy();
			return true;
		}
		return false;
	};
	return self;
});
// Mutant bullet class
var MutantBullet = Container.expand(function () {
	var self = Container.call(this);
	var bulletSprite = self.attachAsset('mutantBullet', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.width = bulletSprite.width;
	self.height = bulletSprite.height;
	self.speed = 14;
	self.update = function () {
		if (typeof self.speedX === "number") {
			self.x += self.speedX;
		}
		if (typeof self.speed === "number") {
			self.y += self.speed;
		}
	};
	return self;
});

/**** 
* Initialize Game
****/ 
var game = new LK.Game({
	backgroundColor: 0x181818
});

/**** 
* Game Code
****/ 
// Game variables
// Hero: blue box
// Mutant: green ellipse
// Hero bullet: yellow box
// Mutant bullet: red ellipse
// Sound effects
// Music
var hero;
var mutants = [];
var heroBullets = [];
var mutantBullets = [];
var lastHeroX = 0,
	lastHeroY = 0;
var score = 0;
var scoreTxt;
var wave = 1;
var spawnTimer = 0;
var gameOver = false;
var bossSpawned = false;
var difficultyLevel = 0; // Increases each time a boss or mutant wave is spawned
// Score display
scoreTxt = new Text2('0', {
	size: 120,
	fill: "#fff"
});
scoreTxt.anchor.set(0.5, 0);
LK.gui.top.addChild(scoreTxt);
// Start music
LK.playMusic('bgmusic');
// Create hero
hero = new Hero();
hero.x = 2048 / 2;
hero.y = 2732 - 350;
game.addChild(hero);
// Helper: spawn a wave of mutants
function spawnMutantWave() {
	// Boss appears at score >= 100, only once per game
	if (typeof bossSpawned === "undefined") {
		bossSpawned = false;
	}
	if (score >= 100 && !bossSpawned) {
		difficultyLevel++; // Increase difficulty each time boss spawns
		var boss = new Boss(difficultyLevel);
		boss.x = 2048 / 2;
		boss.y = -220;
		mutants.push(boss);
		game.addChild(boss);
		bossSpawned = true;
	} else {
		difficultyLevel++; // Increase difficulty each time a new wave spawns
		var m = new Mutant(difficultyLevel);
		// Spawn mutant at a more varied X position (avoid edges)
		var minX = 120;
		var maxX = 2048 - 120;
		m.x = minX + Math.random() * (maxX - minX);
		// More variety in Y spawn
		m.y = -100 - Math.random() * 400;
		mutants.push(m);
		game.addChild(m);
		wave++;
	}
}
// Initial wave
spawnMutantWave();
// Touch/mouse drag controls removed -- hero is now controlled by tap-to-move
// Tap left/right half of screen to move hero horizontally by a fixed amount
game.down = function (x, y, obj) {
	var minX = hero.radius + 20;
	var maxX = 2048 - hero.radius - 20;
	// Only move horizontally, keep Y fixed
	var moveAmount = 220;
	if (x < 2048 / 2) {
		// Tap left half: move left
		hero.x = Math.max(minX, hero.x - moveAmount);
	} else {
		// Tap right half: move right
		hero.x = Math.min(maxX, hero.x + moveAmount);
	}
};
game.move = null;
game.up = null;
// Main game loop
game.update = function () {
	if (gameOver) {
		return;
	}
	// Hero update
	hero.update();
	// Show fire rate level above hero
	if (!hero.fireRateTxt) {
		hero.fireRateTxt = new Text2('', {
			size: 60,
			fill: "#fff"
		});
		hero.fireRateTxt.anchor.set(0.5, 1);
		game.addChild(hero.fireRateTxt);
	}
	hero.fireRateTxt.x = hero.x;
	hero.fireRateTxt.y = hero.y - hero.radius - 30;
	var fireRateLevel = Math.floor(score / 50);
	if (fireRateLevel > 0) {
		hero.fireRateTxt.setText("Lv." + (fireRateLevel + 1));
		hero.fireRateTxt.visible = true;
	} else {
		hero.fireRateTxt.visible = false;
	}
	// Hero auto-shoots, fire rate improves every 50 points (min cooldown 4 ticks)
	var minCooldown = 4;
	var baseCooldown = 10;
	var fireRateLevel = Math.floor(score / 50);
	var heroCooldown = Math.max(baseCooldown - fireRateLevel * 2, minCooldown);
	if (LK.ticks % heroCooldown === 0) {
		hero.shoot();
	}
	// Mutant update
	for (var i = mutants.length - 1; i >= 0; i--) {
		var m = mutants[i];
		m.update();
		// Remove if off screen
		if (m.y > 2732 + 100) {
			m.destroy();
			mutants.splice(i, 1);
			continue;
		}
		// Mutant collides with hero (game over)
		if (m.intersects(hero)) {
			LK.effects.flashScreen(0xff0000, 1000);
			LK.getSound('heroHit').play();
			gameOver = true;
			LK.showGameOver();
			return;
		}
	}
	// Hero bullets update
	for (var i = heroBullets.length - 1; i >= 0; i--) {
		var b = heroBullets[i];
		b.update();
		// Remove if off screen
		if (b.y < -100) {
			b.destroy();
			heroBullets.splice(i, 1);
			continue;
		}
		// Check collision with mutants
		var hit = false;
		for (var j = mutants.length - 1; j >= 0; j--) {
			var m = mutants[j];
			if (b.intersects(m)) {
				b.destroy();
				heroBullets.splice(i, 1);
				if (m.hit()) {
					// Mutant destroyed
					mutants.splice(j, 1);
					score += 10;
					scoreTxt.setText(score);
				} else {
					score += 2;
					scoreTxt.setText(score);
				}
				hit = true;
				break;
			}
		}
		if (hit) {
			continue;
		}
	}
	// Mutant bullets update
	for (var i = mutantBullets.length - 1; i >= 0; i--) {
		var b = mutantBullets[i];
		b.update();
		// Remove if off screen
		if (b.y > 2732 + 100) {
			b.destroy();
			mutantBullets.splice(i, 1);
			continue;
		}
		// Check collision with hero
		if (b.intersects(hero)) {
			LK.effects.flashScreen(0xff0000, 1000);
			LK.getSound('heroHit').play();
			b.destroy();
			mutantBullets.splice(i, 1);
			gameOver = true;
			LK.showGameOver();
			return;
		}
	}
	// Spawn new wave if all mutants gone
	if (mutants.length === 0 && spawnTimer === 0) {
		spawnTimer = 40; // Wait 40 ticks before next wave
	}
	if (spawnTimer > 0) {
		spawnTimer--;
		if (spawnTimer === 0) {
			spawnMutantWave();
		}
	}
};
// Reset game state on restart
game.on('reset', function () {
	// Remove all objects
	for (var i = 0; i < mutants.length; i++) {
		mutants[i].destroy();
	}
	for (var i = 0; i < heroBullets.length; i++) {
		heroBullets[i].destroy();
	}
	for (var i = 0; i < mutantBullets.length; i++) {
		mutantBullets[i].destroy();
	}
	mutants = [];
	heroBullets = [];
	mutantBullets = [];
	score = 0;
	scoreTxt.setText(score);
	wave = 1;
	spawnTimer = 0;
	gameOver = false;
	bossSpawned = false;
	hero.x = 2048 / 2;
	hero.y = 2732 - 350;
	spawnMutantWave();
	LK.playMusic('bgmusic');
});

===================================================================
--- original.js
+++ change.js
@@ -98,9 +98,11 @@
 	self.radius = heroSprite.width * 0.5;
 	self.shootCooldown = 0; // ticks until next shot allowed
 	// Called every tick
 	self.update = function () {
-		if (self.shootCooldown > 0) self.shootCooldown--;
+		if (self.shootCooldown > 0) {
+			self.shootCooldown--;
+		}
 	};
 	// Shoot a bullet upwards
 	self.shoot = function () {
 		if (self.shootCooldown === 0) {
@@ -253,9 +255,11 @@
 game.addChild(hero);
 // Helper: spawn a wave of mutants
 function spawnMutantWave() {
 	// Boss appears at score >= 100, only once per game
-	if (typeof bossSpawned === "undefined") bossSpawned = false;
+	if (typeof bossSpawned === "undefined") {
+		bossSpawned = false;
+	}
 	if (score >= 100 && !bossSpawned) {
 		difficultyLevel++; // Increase difficulty each time boss spawns
 		var boss = new Boss(difficultyLevel);
 		boss.x = 2048 / 2;
@@ -297,9 +301,11 @@
 game.move = null;
 game.up = null;
 // Main game loop
 game.update = function () {
-	if (gameOver) return;
+	if (gameOver) {
+		return;
+	}
 	// Hero update
 	hero.update();
 	// Show fire rate level above hero
 	if (!hero.fireRateTxt) {
@@ -375,9 +381,11 @@
 				hit = true;
 				break;
 			}
 		}
-		if (hit) continue;
+		if (hit) {
+			continue;
+		}
 	}
 	// Mutant bullets update
 	for (var i = mutantBullets.length - 1; i >= 0; i--) {
 		var b = mutantBullets[i];
@@ -412,11 +420,17 @@
 };
 // Reset game state on restart
 game.on('reset', function () {
 	// Remove all objects
-	for (var i = 0; i < mutants.length; i++) mutants[i].destroy();
-	for (var i = 0; i < heroBullets.length; i++) heroBullets[i].destroy();
-	for (var i = 0; i < mutantBullets.length; i++) mutantBullets[i].destroy();
+	for (var i = 0; i < mutants.length; i++) {
+		mutants[i].destroy();
+	}
+	for (var i = 0; i < heroBullets.length; i++) {
+		heroBullets[i].destroy();
+	}
+	for (var i = 0; i < mutantBullets.length; i++) {
+		mutantBullets[i].destroy();
+	}
 	mutants = [];
 	heroBullets = [];
 	mutantBullets = [];
 	score = 0;