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

/**** 
* Classes
****/ 
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.health = 1;
	self.lastY = 0;
	self.lastIntersecting = false;
	self.takeDamage = function (amount) {
		self.health -= amount;
	};
	self.update = function () {
		self.y += self.speed;
		if (self.lastY === undefined) self.lastY = self.y;
	};
	return self;
});
var Player = Container.expand(function () {
	var self = Container.call(this);
	var playerGraphics = self.attachAsset('player', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.moveX = 0;
	self.speed = 8;
	self.update = function () {
		self.x += self.moveX * self.speed;
		if (self.x < 40) self.x = 40;
		if (self.x > 2048 - 40) self.x = 2048 - 40;
	};
	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 = -15;
	self.lastY = 0;
	self.update = function () {
		self.y += self.speed;
		if (self.lastY === undefined) self.lastY = self.y;
	};
	return self;
});
var SkillUpgrade = Container.expand(function () {
	var self = Container.call(this);
	var background = self.attachAsset('upgradeBackground', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	background.width = 2048;
	background.height = 2732;
	background.x = 1024;
	background.y = 1366;
	var titleText = new Text2('Choose an Upgrade', {
		size: 120,
		fill: 0xFFFFFF
	});
	titleText.anchor.set(0.5, 0);
	titleText.x = 1024;
	titleText.y = 200;
	self.addChild(titleText);
	var skills = [{
		name: 'Faster Bullets',
		effect: 'bulletSpeed'
	}, {
		name: 'Rapid Fire',
		effect: 'fireRate'
	}, {
		name: 'More Health',
		effect: 'playerHealth'
	}];
	self.skillButtons = [];
	for (var i = 0; i < skills.length; i++) {
		var buttonBg = self.attachAsset('skillButton', {
			anchorX: 0.5,
			anchorY: 0.5
		});
		buttonBg.width = 600;
		buttonBg.height = 200;
		buttonBg.x = 1024;
		buttonBg.y = 800 + i * 300;
		var skillText = new Text2(skills[i].name, {
			size: 80,
			fill: 0xFFFFFF
		});
		skillText.anchor.set(0.5, 0.5);
		skillText.x = 1024;
		skillText.y = 800 + i * 300;
		self.addChild(skillText);
		self.skillButtons.push({
			bg: buttonBg,
			x: 1024,
			y: 800 + i * 300,
			effect: skills[i].effect,
			index: i
		});
	}
	self.selectedSkill = null;
	return self;
});

/**** 
* Initialize Game
****/ 
var game = new LK.Game({
	backgroundColor: 0x1a1a2e
});

/**** 
* Game Code
****/ 
var player = game.addChild(new Player());
player.x = 2048 / 2;
player.y = 2400;
var playerBullets = [];
var enemies = [];
var currentWave = 1;
var enemiesKilledInWave = 0;
var enemiesToKillInWave = 5;
var gameScore = 0;
var playerStats = {
	bulletSpeed: -15,
	fireRate: 400,
	playerHealth: 1
};
var upgradeScreenActive = false;
var waveText = new Text2('Wave: ' + currentWave, {
	size: 100,
	fill: 0xFFFFFF
});
waveText.anchor.set(0.5, 0);
LK.gui.top.addChild(waveText);
var scoreText = new Text2('Score: 0', {
	size: 80,
	fill: 0xFFFF00
});
scoreText.anchor.set(0.5, 1);
LK.gui.bottom.addChild(scoreText);
var enemyCountText = new Text2('Enemies: 0/' + enemiesToKillInWave, {
	size: 80,
	fill: 0x00FFFF
});
enemyCountText.anchor.set(0, 1);
LK.gui.bottomLeft.addChild(enemyCountText);
var dragNode = null;
var touchStartX = 0;
function spawnEnemy() {
	var newEnemy = new Enemy();
	newEnemy.x = Math.random() * (2048 - 140) + 70;
	newEnemy.y = -50;
	var speedMultiplier = 1 + (currentWave - 1) * 0.3;
	newEnemy.speed = 2 + speedMultiplier;
	newEnemy.health = 1 + Math.floor((currentWave - 1) / 3);
	newEnemy.lastY = newEnemy.y;
	newEnemy.lastIntersecting = false;
	enemies.push(newEnemy);
	game.addChild(newEnemy);
}
function applySkillUpgrade(skillEffect) {
	if (skillEffect === 'bulletSpeed') {
		playerStats.bulletSpeed -= 3;
	} else if (skillEffect === 'fireRate') {
		playerStats.fireRate = Math.max(150, playerStats.fireRate - 50);
	} else if (skillEffect === 'playerHealth') {
		playerStats.playerHealth += 1;
	}
}
function fireProjectile() {
	var bullet = new PlayerBullet();
	bullet.x = player.x;
	bullet.y = player.y - 40;
	bullet.speed = playerStats.bulletSpeed;
	bullet.lastY = bullet.y;
	playerBullets.push(bullet);
	game.addChild(bullet);
	LK.getSound('shoot').play();
}
var spawnTimer = LK.setInterval(function () {
	if (enemies.length < 3 + currentWave) {
		spawnEnemy();
	}
}, 800);
var fireTimer = LK.setInterval(function () {
	fireProjectile();
}, playerStats.fireRate);
game.down = function (x, y, obj) {
	dragNode = player;
};
game.move = function (x, y, obj) {
	if (dragNode) {
		player.x = x;
		if (player.x < 40) player.x = 40;
		if (player.x > 2048 - 40) player.x = 2048 - 40;
	}
};
game.up = function (x, y, obj) {
	dragNode = null;
};
game.update = function () {
	for (var a = playerBullets.length - 1; a >= 0; a--) {
		var bullet = playerBullets[a];
		if (bullet.y < -50) {
			bullet.destroy();
			playerBullets.splice(a, 1);
			continue;
		}
		var bulletDestroyed = false;
		for (var b = enemies.length - 1; b >= 0; b--) {
			var enemy = enemies[b];
			if (bullet.intersects(enemy)) {
				enemy.takeDamage(1);
				LK.getSound('enemyHit').play();
				if (enemy.health <= 0) {
					enemy.destroy();
					enemies.splice(b, 1);
					gameScore += 10;
					enemiesKilledInWave++;
					scoreText.setText('Score: ' + gameScore);
					enemyCountText.setText('Enemies: ' + enemiesKilledInWave + '/' + enemiesToKillInWave);
					if (enemiesKilledInWave >= enemiesToKillInWave) {
						currentWave++;
						enemiesKilledInWave = 0;
						enemiesToKillInWave = 5 + (currentWave - 1) * 2;
						waveText.setText('Wave: ' + currentWave);
						enemyCountText.setText('Enemies: 0/' + enemiesToKillInWave);
						for (var c = enemies.length - 1; c >= 0; c--) {
							enemies[c].destroy();
							enemies.splice(c, 1);
						}
						if (currentWave % 5 === 0) {
							upgradeScreenActive = true;
							LK.clearInterval(spawnTimer);
							LK.clearInterval(fireTimer);
							var upgradeScreen = game.addChild(new SkillUpgrade());
							game.down = function (x, y, obj) {
								if (upgradeScreenActive && upgradeScreen && upgradeScreen.skillButtons) {
									for (var sb = 0; sb < upgradeScreen.skillButtons.length; sb++) {
										var btn = upgradeScreen.skillButtons[sb];
										var distance = Math.sqrt(Math.pow(x - btn.x, 2) + Math.pow(y - btn.y, 2));
										if (distance < 300) {
											applySkillUpgrade(btn.effect);
											upgradeScreen.destroy();
											upgradeScreenActive = false;
											spawnTimer = LK.setInterval(function () {
												if (enemies.length < 3 + currentWave) {
													spawnEnemy();
												}
											}, 800);
											fireTimer = LK.setInterval(function () {
												fireProjectile();
											}, playerStats.fireRate);
											game.down = function (x, y, obj) {
												dragNode = player;
											};
											return;
										}
									}
								} else if (!upgradeScreenActive) {
									dragNode = player;
								}
							};
						}
					}
				}
				bullet.destroy();
				playerBullets.splice(a, 1);
				bulletDestroyed = true;
				break;
			}
		}
	}
	for (var i = enemies.length - 1; i >= 0; i--) {
		var enemy = enemies[i];
		if (enemy.y > 2732 + 50) {
			enemy.destroy();
			enemies.splice(i, 1);
			continue;
		}
		if (enemy.y > 2400 + 50) {
			LK.effects.flashScreen(0xff0000, 1000);
			LK.getSound('playerHit').play();
			LK.clearInterval(spawnTimer);
			LK.clearInterval(fireTimer);
			LK.showGameOver();
			return;
		}
		var currentIntersecting = enemy.intersects(player);
		if (!enemy.lastIntersecting && currentIntersecting) {
			LK.effects.flashScreen(0xff0000, 1000);
			LK.getSound('playerHit').play();
			LK.clearInterval(spawnTimer);
			LK.clearInterval(fireTimer);
			LK.showGameOver();
			return;
		}
		enemy.lastIntersecting = currentIntersecting;
	}
};
LK.playMusic('bgmusic');

===================================================================
--- original.js
+++ change.js
@@ -288,9 +288,9 @@
 			enemy.destroy();
 			enemies.splice(i, 1);
 			continue;
 		}
-		if (enemy.lastY <= 2400 && enemy.y > 2400) {
+		if (enemy.y > 2400 + 50) {
 			LK.effects.flashScreen(0xff0000, 1000);
 			LK.getSound('playerHit').play();
 			LK.clearInterval(spawnTimer);
 			LK.clearInterval(fireTimer);