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

/**** 
* Classes
****/ 
var Enemy = Container.expand(function (enemyType) {
	var self = Container.call(this);
	self.enemyType = enemyType || 1;
	var assetName = self.enemyType === 1 ? 'enemy1' : 'enemy2';
	var enemyGraphics = self.attachAsset(assetName, {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.speed = self.enemyType === 1 ? 4 : 5;
	self.moveSpeed = 1.5;
	self.direction = 1;
	self.points = self.enemyType === 1 ? 10 : 20;
	self.shootTimer = Math.random() * 120 + 60;
	self.diving = false;
	self.diveSpeed = 0;
	self.zigzagTimer = 0;
	self.zigzagDirection = 1;
	self.shootsBeforeDive = 0;
	self.maxShootsBeforeDive = 2 + Math.floor(Math.random() * 3);
	self.hasReachedMiddle = false;
	self.update = function () {
		if (self.diving) {
			self.y += self.diveSpeed;
			self.diveSpeed += 0.4;
		} else {
			// Move down until reaching middle of screen
			if (!self.hasReachedMiddle) {
				self.y += self.speed;
				if (self.y >= 2732 / 3) {
					self.hasReachedMiddle = true;
				}
			} else {
				// Zigzag movement once in middle
				self.zigzagTimer++;
				if (self.zigzagTimer > 120) {
					self.zigzagDirection *= -1;
					self.zigzagTimer = 0;
				}
				self.x += self.zigzagDirection * self.moveSpeed;
				self.y += self.speed * 0.2;
			}
		}
		self.shootTimer--;
		if (self.shootTimer <= 0 && !self.diving && self.hasReachedMiddle) {
			self.shootTimer = Math.random() * 100 + 80;
			var bullet = new EnemyBullet();
			bullet.x = self.x;
			bullet.y = self.y + 40;
			enemyBullets.push(bullet);
			game.addChild(bullet);
			self.shootsBeforeDive++;
		}
		if (self.shootsBeforeDive >= self.maxShootsBeforeDive && Math.random() < 0.003 && !self.diving && self.hasReachedMiddle) {
			self.diving = true;
			self.diveSpeed = 2;
		}
	};
	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('playerShip', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.shootCooldown = 0;
	self.lives = 3;
	self.maxHealth = 100;
	self.health = self.maxHealth;
	self.update = function () {
		if (self.shootCooldown > 0) {
			self.shootCooldown--;
		}
	};
	self.shoot = function () {
		if (self.shootCooldown <= 0) {
			var bullet = new PlayerBullet();
			bullet.x = self.x;
			bullet.y = self.y - 50;
			playerBullets.push(bullet);
			game.addChild(bullet);
			LK.getSound('shoot').play();
			self.shootCooldown = 10;
		}
	};
	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 = -18;
	self.update = function () {
		self.y += self.speed;
	};
	return self;
});

/**** 
* Initialize Game
****/ 
var game = new LK.Game({
	backgroundColor: 0x000033
});

/**** 
* Game Code
****/ 
var player = game.addChild(new Player());
player.x = 2048 / 2;
player.y = 2732 - 150;
var playerBullets = [];
var enemyBullets = [];
var enemies = [];
var wave = 1;
var enemiesPerWave = 8;
var waveSpawnTimer = 0;
var enemiesSpawned = 0;
var gameStarted = false;
var scoreTxt = new Text2('Score: 0', {
	size: 60,
	fill: 0xFFFFFF
});
scoreTxt.anchor.set(0, 0);
scoreTxt.x = 150;
scoreTxt.y = 50;
LK.gui.addChild(scoreTxt);
var waveTxt = new Text2('Wave: 1', {
	size: 60,
	fill: 0xFFFFFF
});
waveTxt.anchor.set(1, 0);
waveTxt.x = -150;
waveTxt.y = 50;
LK.gui.topRight.addChild(waveTxt);
var healthTxt = new Text2('Health: 100', {
	size: 60,
	fill: 0x00ff00
});
healthTxt.anchor.set(0.5, 0);
healthTxt.x = 0;
healthTxt.y = 50;
LK.gui.top.addChild(healthTxt);
var dragTarget = null;
function spawnEnemyWave() {
	if (enemiesSpawned < enemiesPerWave) {
		if (waveSpawnTimer <= 0) {
			var enemyType = Math.random() < 0.7 ? 1 : 2;
			var enemy = new Enemy(enemyType);
			enemy.x = 200 + enemiesSpawned * 200;
			enemy.y = -100;
			enemies.push(enemy);
			game.addChild(enemy);
			enemiesSpawned++;
			waveSpawnTimer = 30;
		} else {
			waveSpawnTimer--;
		}
	}
}
function checkCollisions() {
	// Player bullets vs enemies
	for (var i = playerBullets.length - 1; i >= 0; i--) {
		var bullet = playerBullets[i];
		for (var j = enemies.length - 1; j >= 0; j--) {
			var enemy = enemies[j];
			if (bullet.intersects(enemy)) {
				LK.setScore(LK.getScore() + enemy.points);
				scoreTxt.setText('Score: ' + LK.getScore());
				LK.getSound('enemyHit').play();
				bullet.destroy();
				playerBullets.splice(i, 1);
				enemy.destroy();
				enemies.splice(j, 1);
				break;
			}
		}
	}
	// Enemy bullets vs player
	for (var i = enemyBullets.length - 1; i >= 0; i--) {
		var bullet = enemyBullets[i];
		if (bullet.intersects(player)) {
			player.health -= 20;
			healthTxt.setText('Health: ' + player.health);
			if (player.health <= 0) {
				healthTxt.tint = 0xff0000;
			} else if (player.health <= 30) {
				healthTxt.tint = 0xff6600;
			} else {
				healthTxt.tint = 0x00ff00;
			}
			LK.effects.flashScreen(0xff0000, 500);
			bullet.destroy();
			enemyBullets.splice(i, 1);
			LK.getSound('explosion').play();
			if (player.health <= 0) {
				LK.showGameOver();
				return;
			}
		}
	}
	// Enemies vs player
	for (var i = enemies.length - 1; i >= 0; i--) {
		var enemy = enemies[i];
		if (enemy.intersects(player)) {
			player.health -= 30;
			healthTxt.setText('Health: ' + player.health);
			if (player.health <= 0) {
				healthTxt.tint = 0xff0000;
			} else if (player.health <= 30) {
				healthTxt.tint = 0xff6600;
			} else {
				healthTxt.tint = 0x00ff00;
			}
			LK.effects.flashScreen(0xff0000, 500);
			enemy.destroy();
			enemies.splice(i, 1);
			LK.getSound('explosion').play();
			if (player.health <= 0) {
				LK.showGameOver();
				return;
			}
		}
	}
}
function updateBullets() {
	// Clean up player bullets
	for (var i = playerBullets.length - 1; i >= 0; i--) {
		var bullet = playerBullets[i];
		if (bullet.y < -50) {
			bullet.destroy();
			playerBullets.splice(i, 1);
		}
	}
	// Clean up enemy bullets
	for (var i = enemyBullets.length - 1; i >= 0; i--) {
		var bullet = enemyBullets[i];
		if (bullet.y > 2732 + 50) {
			bullet.destroy();
			enemyBullets.splice(i, 1);
		}
	}
}
function updateEnemies() {
	// Clean up enemies that went off screen
	for (var i = enemies.length - 1; i >= 0; i--) {
		var enemy = enemies[i];
		if (enemy.y > 2732 + 100) {
			enemy.destroy();
			enemies.splice(i, 1);
		}
		// Reverse direction if hitting screen edges
		if (enemy.x <= 50 || enemy.x >= 1998) {
			enemy.direction *= -1;
		}
	}
}
function checkWaveComplete() {
	if (enemies.length === 0 && enemiesSpawned >= enemiesPerWave) {
		wave++;
		enemiesPerWave += 2;
		enemiesSpawned = 0;
		waveSpawnTimer = 0;
		waveTxt.setText('Wave: ' + wave);
		// Bonus points for completing wave
		LK.setScore(LK.getScore() + wave * 50);
		scoreTxt.setText('Score: ' + LK.getScore());
	}
}
game.down = function (x, y, obj) {
	dragTarget = player;
	player.x = x;
	player.y = Math.max(100, Math.min(2632, y));
	player.shoot();
};
game.move = function (x, y, obj) {
	if (dragTarget) {
		dragTarget.x = Math.max(40, Math.min(2008, x));
		dragTarget.y = Math.max(100, Math.min(2632, y));
	}
};
game.up = function (x, y, obj) {
	dragTarget = null;
};
game.update = function () {
	if (!gameStarted) {
		gameStarted = true;
	}
	spawnEnemyWave();
	updateBullets();
	updateEnemies();
	checkCollisions();
	checkWaveComplete();
	// Auto-shoot for continuous fire
	if (LK.ticks % 8 === 0) {
		player.shoot();
	}
};

===================================================================
--- original.js
+++ change.js
@@ -13,10 +13,10 @@
 	var enemyGraphics = self.attachAsset(assetName, {
 		anchorX: 0.5,
 		anchorY: 0.5
 	});
-	self.speed = self.enemyType === 1 ? 2.5 : 3;
-	self.moveSpeed = 0.8;
+	self.speed = self.enemyType === 1 ? 4 : 5;
+	self.moveSpeed = 1.5;
 	self.direction = 1;
 	self.points = self.enemyType === 1 ? 10 : 20;
 	self.shootTimer = Math.random() * 120 + 60;
 	self.diving = false;
@@ -28,9 +28,9 @@
 	self.hasReachedMiddle = false;
 	self.update = function () {
 		if (self.diving) {
 			self.y += self.diveSpeed;
-			self.diveSpeed += 0.2;
+			self.diveSpeed += 0.4;
 		} else {
 			// Move down until reaching middle of screen
 			if (!self.hasReachedMiddle) {
 				self.y += self.speed;
@@ -70,9 +70,9 @@
 	var bulletGraphics = self.attachAsset('enemyBullet', {
 		anchorX: 0.5,
 		anchorY: 0.5
 	});
-	self.speed = 5;
+	self.speed = 8;
 	self.update = function () {
 		self.y += self.speed;
 	};
 	return self;
@@ -110,9 +110,9 @@
 	var bulletGraphics = self.attachAsset('playerBullet', {
 		anchorX: 0.5,
 		anchorY: 0.5
 	});
-	self.speed = -12;
+	self.speed = -18;
 	self.update = function () {
 		self.y += self.speed;
 	};
 	return self;