/**** 
* Classes
****/
// LifePickup class
var LifePickup = Container.expand(function () {
	var self = Container.call(this);
	var lifeGraphics = self.createAsset('lifePickup', 'Extra Life Pickup', 0.5, 0.5);
	self.pickup = function (hero) {
		hero.lives += 1;
		livesDisplay.updateLives(hero.lives);
		self.destroy();
	};
});
// HealthBar class
var LivesDisplay = Container.expand(function () {
	var self = Container.call(this);
	self.lives = 3;
	self.livesText = new Text2('Lives: ' + self.lives, {
		size: 100,
		fill: '#ffffff'
	});
	self.livesText.anchor.set(0, 0);
	LK.gui.topLeft.addChild(self.livesText);
	self.updateLives = function (newLives) {
		self.lives = newLives;
		self.livesText.setText('Lives: ' + self.lives);
	};
});
// ScoreDisplay class
var ScoreDisplay = Container.expand(function () {
	var self = Container.call(this);
	self.scoreText = new Text2('Score: 0', {
		size: 100,
		fill: "#ffffff"
	});
	self.scoreText.anchor.set(0.5, 0);
	LK.gui.top.addChild(self.scoreText);
	self.updateScore = function (score) {
		self.scoreText.setText('Score: ' + score);
	};
});
// Hero class
var Hero = Container.expand(function () {
	var self = Container.call(this);
	self.updateRotation = function (angle) {
		self.rotation = angle;
	};
	var heroGraphics = self.createAsset('hero', 'Hero character', 0.5, 0.5);
	self.x = 2048 / 2;
	self.y = 2732 / 2;
	self.lives = 3; // Hero starts with 3 lives
});
// Base Enemy class
var BaseEnemy = Container.expand(function () {
	var self = Container.call(this);
	var enemyGraphics = self.createAsset('enemy', 'Base Enemy character', 0.5, 0.5);
	self.enemyType = 'base';
	self.setGraphics = function () {
		if (self.enemyType === 'shooting') {
			self.createAsset('shootingEnemy', 'Shooting Enemy character', 0.5, 0.5);
		}
	};
	self.speed = 2;
	self.move = function () {
		var dx = hero.x - self.x;
		var dy = hero.y - self.y;
		var angle = Math.atan2(dy, dx);
		self.x += Math.cos(angle) * self.speed;
		self.y += Math.sin(angle) * self.speed;
	};
});
// KamikazeEnemy class
var KamikazeEnemy = Container.expand(function () {
	var self = Container.call(this);
	var kamikazeEnemyGraphics = self.createAsset('kamikazeEnemy', 'Kamikaze Enemy character', 0.5, 0.5);
	self.speed = 4;
	self.move = function () {
		// Movement towards the hero's position
		var dx = hero.x - self.x;
		var dy = hero.y - self.y;
		var angle = Math.atan2(dy, dx);
		self.x += Math.cos(angle) * self.speed;
		self.y += Math.sin(angle) * self.speed;
	};
});
// ShootingEnemy class
var ShootingEnemy = Container.expand(function () {
	var self = Container.call(this);
	var shootingEnemyGraphics = self.createAsset('shootingEnemy', 'Shooting Enemy character', 0.5, 0.5);
	self.speed = 3;
	self.shootingRate = 120; // Shoot every 2 seconds
	self.lastShotTick = 0;
	self.move = function () {
		// Movement towards the hero's position
		var dx = hero.x - self.x;
		var dy = hero.y - self.y;
		var angle = Math.atan2(dy, dx);
		self.x += Math.cos(angle) * self.speed;
		self.y += Math.sin(angle) * self.speed;
	};
	self.shoot = function () {
		if (LK.ticks - self.lastShotTick >= self.shootingRate) {
			var bullet = new EnemyBullet();
			// Calculate the direction towards the hero at the time of shooting
			var dx = hero.x - self.x;
			var dy = hero.y - self.y;
			var magnitude = Math.sqrt(dx * dx + dy * dy);
			bullet.direction = {
				x: dx / magnitude,
				y: dy / magnitude
			};
			bullet.x = self.x;
			bullet.y = self.y;
			enemyBullets.push(bullet);
			game.addChild(bullet);
			self.lastShotTick = LK.ticks;
		}
	};
});
// EnemyBullet class
var EnemyBullet = Container.expand(function () {
	var self = Container.call(this);
	var bulletGraphics = self.createAsset('enemyBullet', 'Enemy Bullet Graphics', 0.5, 0.5);
	self.speed = 5;
	self.move = function () {
		// Movement in a straight line towards the hero's last known position
		self.x += self.direction.x * self.speed;
		self.y += self.direction.y * self.speed;
	};
});
// HeroBullet class
var HeroBullet = Container.expand(function () {
	var self = Container.call(this);
	var bulletGraphics = self.createAsset('heroBullet', 'Hero Bullet Graphics', 0.5, 0.5);
	self.speed = 10;
	self.move = function () {
		// Movement logic for the bullet will be defined in the fireBullet function
	};
});

/**** 
* Initialize Game
****/
var game = new LK.Game({
	backgroundColor: 0x003300 // Init game with a darker green background
});

/**** 
* Game Code
****/
// Initialize hero, lives display, and score display
var hero = game.addChild(new Hero());
var livesDisplay = game.addChild(new LivesDisplay());
var scoreDisplay = game.addChild(new ScoreDisplay());
var score = 0; // Global score variable

// Initialize enemies and bullets arrays
var enemies = [];
var bullets = [];
var enemyBullets = []; // Array for bullets shot by ShootingEnemy
// Initialize firing rate, enemy spawn rate, and wave system
var firingRate = 30; // Increased firing rate (ticks)
var spawnRate = 180; // Increased enemy spawn rate (ticks) to decrease intensity
var waveCount = 0; // Number of waves that have passed
var enemiesPerWave = 10; // Base number of enemies per wave
var enemySpeedIncrease = 0.01; // Speed increase per wave
var waveCounterDisplay = new Text2('Wave: 1', {
	size: 100,
	fill: "#ffffff"
});
waveCounterDisplay.anchor.set(1, 0);
LK.gui.topRight.addChild(waveCounterDisplay);
var score = 0; // Global score variable

// Function to spawn enemies
function spawnEnemy() {
	waveCount++;
	waveCounterDisplay.setText('Wave: ' + waveCount);
	var initialEnemies = 10;
	var additionalEnemies = waveCount - 1; // Additional enemies spawned gradually
	var enemiesToSpawn = initialEnemies + additionalEnemies;
	var spawnInterval = 300; // Spawn an enemy every 0.3 seconds
	var spawnEnemyAtIndex = function spawnEnemyAtIndex(index) {
		if (index < enemiesToSpawn) {
			var angle = Math.random() * Math.PI * 2; // Random angle
			var radius = 1200; // Spawn circle radius
			var enemyType = Math.random();
			var enemy = enemyType < 0.33 ? new BaseEnemy() : enemyType < 0.66 ? new ShootingEnemy() : new KamikazeEnemy();
			enemy.speed += enemy.speed * waveCount * enemySpeedIncrease; // Increase speed by 1% per wave
			enemy.x = 1024 + radius * Math.cos(angle);
			enemy.y = 1366 + radius * Math.sin(angle);
			enemies.push(enemy);
			game.addChild(enemy);
			LK.setTimeout(function () {
				spawnEnemyAtIndex(index + 1);
			}, spawnInterval);
		}
	};
	spawnEnemyAtIndex(0);
}

// Function to fire a bullet
function fireBullet() {
	if (enemies.length === 0) {
		return;
	} // No enemies to shoot at
	var nearestEnemy = enemies.reduce(function (closest, enemy) {
		var closestDist = Math.sqrt(Math.pow(closest.x - hero.x, 2) + Math.pow(closest.y - hero.y, 2));
		var enemyDist = Math.sqrt(Math.pow(enemy.x - hero.x, 2) + Math.pow(enemy.y - hero.y, 2));
		return enemyDist < closestDist ? enemy : closest;
	}, enemies[0]);
	var angleToNearestEnemy = Math.atan2(nearestEnemy.y - hero.y, nearestEnemy.x - hero.x);
	var bullet = new HeroBullet();
	bullet.x = hero.x;
	bullet.y = hero.y;
	hero.updateRotation(angleToNearestEnemy);
	bullet.move = function () {
		this.x += Math.cos(angleToNearestEnemy) * this.speed;
		this.y += Math.sin(angleToNearestEnemy) * this.speed;
	};
	bullets.push(bullet);
	game.addChild(bullet);
}

// Game tick event
LK.on('tick', function () {
	// Move the hero towards the touch position with limited maximum speed
	var maxSpeed = 5;
	if (game.touchPosition) {
		var dx = (game.touchPosition.x - hero.x) * 0.1;
		var dy = (game.touchPosition.y - hero.y) * 0.1;
		var dist = Math.sqrt(dx * dx + dy * dy);
		if (dist > maxSpeed) {
			dx = dx / dist * maxSpeed;
			dy = dy / dist * maxSpeed;
		}
		hero.x += dx;
		hero.y += dy;
	}

	// Move bullets and check for collisions with enemies
	for (var i = bullets.length - 1; i >= 0; i--) {
		bullets[i].move();
		// Check for bullet-enemy collisions
		for (var j = enemies.length - 1; j >= 0; j--) {
			if (bullets[i] && bullets[i].intersects(enemies[j])) {
				// Destroy enemy and update score
				score += 1; // Increment score
				scoreDisplay.updateScore(score); // Update score display
				spawnRate = Math.max(30, spawnRate - 5); // Decrease spawn rate by 5 ticks to a minimum of 30 ticks
				// Chance to drop a LifePickup
				if (Math.random() < 0.01) {
					var lifePickup = new LifePickup();
					lifePickup.x = enemies[j].x;
					lifePickup.y = enemies[j].y;
					game.addChild(lifePickup);
				}
				enemies[j].destroy();
				enemies.splice(j, 1);
				// Destroy bullet
				bullets[i].destroy();
				bullets.splice(i, 1);
				break; // Break out of the enemies loop since the bullet is destroyed
			}
		}
		// Remove bullets that are off-screen
		if (bullets[i] && bullets[i].y < 0) {
			bullets[i].destroy();
			bullets.splice(i, 1);
		}
	}

	// Move enemies
	for (var j = enemies.length - 1; j >= 0; j--) {
		enemies[j].move();
		if (enemies[j].intersects(hero)) {
			if (enemies[j] instanceof KamikazeEnemy) {
				hero.lives -= 1; // Decrease hero's lives by one
				livesDisplay.updateLives(hero.lives); // Update the lives display
				LK.effects.flashScreen(0xff0000, 500); // Flash screen red for half a second
				if (hero.lives <= 0) {
					LK.showGameOver(); // If no lives left, show game over
					return;
				}
			}
			enemies[j].destroy(); // Destroy the enemy that collided with the hero
			enemies.splice(j, 1);
		}
	}
	// Make ShootingEnemy instances shoot at the hero
	for (var i = 0; i < enemies.length; i++) {
		if (enemies[i] instanceof ShootingEnemy) {
			enemies[i].shoot();
		}
	}

	// Spawn enemies only if the previous wave has been cleared
	if (LK.ticks % spawnRate === 0 && enemies.length === 0) {
		spawnEnemy();
	}
	// Move enemy bullets and check for collisions with the hero
	for (var i = enemyBullets.length - 1; i >= 0; i--) {
		enemyBullets[i].move();
		if (enemyBullets[i].intersects(hero)) {
			hero.lives -= 1; // Decrease hero's lives by one
			livesDisplay.updateLives(hero.lives); // Update the lives display
			if (hero.lives <= 0) {
				LK.showGameOver(); // If no lives left, show game over
				return;
			}
			LK.effects.flashScreen(0xff0000, 500); // Flash screen red for half a second
			enemyBullets[i].destroy();
			enemyBullets.splice(i, 1);
		}
		// Remove enemy bullets that are off-screen
		if (enemyBullets[i] && (enemyBullets[i].y < 0 || enemyBullets[i].y > 2732)) {
			enemyBullets[i].destroy();
			enemyBullets.splice(i, 1);
		}
	}
	// Check for hero collision with LifePickup
	for (var i = game.children.length - 1; i >= 0; i--) {
		if (game.children[i] instanceof LifePickup && game.children[i].intersects(hero)) {
			game.children[i].pickup(hero);
		}
	}

	// Fire bullets
	if (LK.ticks % firingRate === 0) {
		fireBullet();
	}
}); // Track touch position
var touchPosition = null;
game.on('move', function (obj) {
	var event = obj.event;
	touchPosition = event.getLocalPosition(game);
	game.touchPosition = touchPosition;
});

===================================================================
--- original.js
+++ change.js
@@ -1,14 +1,15 @@
 /**** 
 * Classes
 ****/
-var PowerUp = Container.expand(function () {
+// LifePickup class
+var LifePickup = Container.expand(function () {
 	var self = Container.call(this);
-	self.type = Math.floor(Math.random() * 3);
-	var powerUpGraphics = self.createAsset('powerUp' + self.type, 'PowerUp Graphics', 0.5, 0.5);
-	self.speed = 2;
-	self.move = function () {
-		self.y += self.speed;
+	var lifeGraphics = self.createAsset('lifePickup', 'Extra Life Pickup', 0.5, 0.5);
+	self.pickup = function (hero) {
+		hero.lives += 1;
+		livesDisplay.updateLives(hero.lives);
+		self.destroy();
 	};
 });
 // HealthBar class
 var LivesDisplay = Container.expand(function () {
@@ -156,9 +157,8 @@
 // Initialize enemies and bullets arrays
 var enemies = [];
 var bullets = [];
 var enemyBullets = []; // Array for bullets shot by ShootingEnemy
-var powerUps = []; // Array for power-ups that are currently in the game
 // Initialize firing rate, enemy spawn rate, and wave system
 var firingRate = 30; // Increased firing rate (ticks)
 var spawnRate = 180; // Increased enemy spawn rate (ticks) to decrease intensity
 var waveCount = 0; // Number of waves that have passed
@@ -247,18 +247,17 @@
 				// Destroy enemy and update score
 				score += 1; // Increment score
 				scoreDisplay.updateScore(score); // Update score display
 				spawnRate = Math.max(30, spawnRate - 5); // Decrease spawn rate by 5 ticks to a minimum of 30 ticks
+				// Chance to drop a LifePickup
+				if (Math.random() < 0.01) {
+					var lifePickup = new LifePickup();
+					lifePickup.x = enemies[j].x;
+					lifePickup.y = enemies[j].y;
+					game.addChild(lifePickup);
+				}
 				enemies[j].destroy();
 				enemies.splice(j, 1);
-				// 20% chance to spawn a power-up
-				if (Math.random() < 0.2) {
-					var powerUp = new PowerUp();
-					powerUp.x = bullets[i].x;
-					powerUp.y = bullets[i].y;
-					powerUps.push(powerUp);
-					game.addChild(powerUp);
-				}
 				// Destroy bullet
 				bullets[i].destroy();
 				bullets.splice(i, 1);
 				break; // Break out of the enemies loop since the bullet is destroyed
@@ -282,38 +281,8 @@
 				if (hero.lives <= 0) {
 					LK.showGameOver(); // If no lives left, show game over
 					return;
 				}
-				// Move power-ups and check for collisions with the hero
-				for (var i = powerUps.length - 1; i >= 0; i--) {
-					powerUps[i].move();
-					if (powerUps[i].intersects(hero)) {
-						// Apply power-up effect based on its type
-						switch (powerUps[i].type) {
-							case 0:
-								// Increase hero's movement speed temporarily
-								hero.speed += 2;
-								LK.setTimeout(function () {
-									hero.speed -= 2;
-								}, 5000);
-								break;
-							case 1:
-								// Increase hero's firing rate temporarily
-								firingRate = Math.max(10, firingRate - 10);
-								LK.setTimeout(function () {
-									firingRate = Math.min(30, firingRate + 10);
-								}, 5000);
-								break;
-							case 2:
-								// Increase hero's lives
-								hero.lives = Math.min(5, hero.lives + 1);
-								livesDisplay.updateLives(hero.lives);
-								break;
-						}
-						powerUps[i].destroy();
-						powerUps.splice(i, 1);
-					}
-				}
 			}
 			enemies[j].destroy(); // Destroy the enemy that collided with the hero
 			enemies.splice(j, 1);
 		}
@@ -348,8 +317,14 @@
 			enemyBullets[i].destroy();
 			enemyBullets.splice(i, 1);
 		}
 	}
+	// Check for hero collision with LifePickup
+	for (var i = game.children.length - 1; i >= 0; i--) {
+		if (game.children[i] instanceof LifePickup && game.children[i].intersects(hero)) {
+			game.children[i].pickup(hero);
+		}
+	}
 
 	// Fire bullets
 	if (LK.ticks % firingRate === 0) {
 		fireBullet();