===================================================================
--- original.js
+++ change.js
@@ -23,22 +23,19 @@
 		anchorX: 0.5,
 		anchorY: 0.5
 	});
 	self.health = 50;
+	self.speed = 3;
 	self.update = function () {
 		// Update logic for enemy
-		// Calculate direction towards hero
+		// Move towards hero
 		var dx = hero.x - self.x;
 		var dy = hero.y - self.y;
 		var distance = Math.sqrt(dx * dx + dy * dy);
-		// Normalize the direction
 		if (distance > 0) {
-			dx /= distance;
-			dy /= distance;
+			self.x += self.speed * dx / distance;
+			self.y += self.speed * dy / distance;
 		}
-		// Move towards the hero
-		self.x += dx * self.speed;
-		self.y += dy * self.speed;
 	};
 	self.takeDamage = function (amount) {
 		self.health -= amount;
 		if (self.health <= 0) {
@@ -46,16 +43,17 @@
 		}
 	};
 	self.die = function () {
 		// Handle enemy death
+		for (var i = bullets.length - 1; i >= 0; i--) {
+			if (bullets[i].intersects(self)) {
+				bullets[i].destroy();
+				bullets.splice(i, 1);
+			}
+		}
 		self.destroy();
 	};
 });
-// BossEnemy class
-var BossEnemy = Enemy.expand(function () {
-	var self = Enemy.call(this);
-	self.health = 200; // BossEnemy has more health
-});
 //<Assets used in the game will automatically appear here>
 // Hero class
 var Hero = Container.expand(function () {
 	var self = Container.call(this);
@@ -101,13 +99,20 @@
 // Initialize hero
 var hero = game.addChild(new Hero());
 hero.x = 2048 / 2;
 hero.y = 2732 - 200;
-// Initialize enemies array and spawn position
+// Initialize enemies array
 var enemies = [];
-var spawnY = 0;
 // Initialize bullets array
 var bullets = [];
+// Function to spawn enemies
+function spawnEnemy() {
+	var enemy = new Enemy();
+	enemy.x = Math.random() * 2048;
+	enemy.y = 0;
+	enemies.push(enemy);
+	game.addChild(enemy);
+}
 // Function to shoot bullets
 function shootBullet() {
 	var bullet = new Bullet();
 	bullet.x = hero.x;
@@ -123,43 +128,54 @@
 // Update game logic
 game.update = function () {
 	// Update hero
 	hero.update();
+	// Handle keyboard events for hero movement and game pause
+	LK.on('keydown', function (event) {
+		switch (event.key) {
+			case 'w':
+				// Move hero up
+				hero.y -= hero.speed;
+				break;
+			case 'a':
+				// Move hero left
+				hero.x -= hero.speed;
+				break;
+			case 's':
+				// Move hero down
+				hero.y += hero.speed;
+				break;
+			case 'd':
+				// Move hero right
+				hero.x += hero.speed;
+				break;
+		}
+	});
 	// Update enemies
 	for (var i = enemies.length - 1; i >= 0; i--) {
 		enemies[i].update();
 		if (enemies[i].intersects(hero)) {
 			hero.takeDamage(10);
 			enemies[i].destroy();
 			enemies.splice(i, 1);
 		}
-		// Spawn new enemy at the top of the screen every 30 frames
-		if (LK.ticks % 30 == 0) {
-			var enemy;
-			if (LK.ticks % 600 == 0) {
-				// Spawn BossEnemy every 600 frames
-				enemy = new BossEnemy();
-			} else {
-				enemy = new Enemy();
-			}
-			enemy.x = Math.random() * 2048; // Random x position
-			enemy.y = 0; // Spawn at the top of the screen
-			enemies.push(enemy);
-			game.addChild(enemy);
-		}
 	}
 	// Update bullets
 	for (var j = bullets.length - 1; j >= 0; j--) {
 		bullets[j].update();
 		for (var k = enemies.length - 1; k >= 0; k--) {
-			if (bullets[j] && enemies[k].health > 0 && bullets[j].intersects(enemies[k])) {
+			if (bullets[j].intersects(enemies[k])) {
 				enemies[k].takeDamage(20);
 				bullets[j].destroy();
 				bullets.splice(j, 1);
 				break;
 			}
 		}
 	}
+	// Spawn enemies periodically
+	if (LK.ticks % 60 == 0) {
+		spawnEnemy();
+	}
 };
 game.move = function (x, y, obj) {
 	hero.x = x;
 };
\ No newline at end of file