===================================================================
--- original.js
+++ change.js
@@ -18,8 +18,18 @@
 	var bulletGraphics = self.createAsset('enemyBullet', 'Enemy Bullet', 0.5, 0.5);
 	self.speed = 5;
 	self.move = function () {
 		self.y += self.speed * 2;
+		if (spaceRanger.intersects(self)) {
+			spaceRanger.lives--;
+			LK.effects.flashScreen(0xff0000, 500);
+			if (spaceRanger.lives <= 0) {
+				LK.showGameOver();
+				return;
+			}
+			self.destroy();
+			aliens.splice(aliens.indexOf(self), 1);
+		}
 	};
 });
 // Define the DimStar class for stars with lower brightness
 var DimStar = Container.expand(function () {
@@ -69,8 +79,19 @@
 	self.baseSpeed = 3;
 	self.speedMultiplier = 1;
 	self.move = function () {
 		self.y += self.baseSpeed * (1 + waveCount * 0.3);
+		if (spaceRanger.intersects(self)) {
+			spaceRanger.lives--;
+			livesDisplay.updateLives(spaceRanger.lives);
+			LK.effects.flashScreen(0xff0000, 500);
+			if (spaceRanger.lives <= 0) {
+				LK.showGameOver();
+				return;
+			}
+			self.destroy();
+			meteors.splice(meteors.indexOf(self), 1);
+		}
 	};
 });
 // Define the Alien class
 var Alien = Container.expand(function () {
@@ -79,8 +100,28 @@
 	self.speed = 2;
 	self.health = 5; // Aliens can take 5 hits before being destroyed
 	self.move = function () {
 		self.y += self.speed * 2;
+		for (var i = heroBullets.length - 1; i >= 0; i--) {
+			if (heroBullets[i].intersects(self)) {
+				self.health--;
+				if (self.health <= 0) {
+					LK.setScore(LK.getScore() + 100);
+					scoreDisplay.updateScore(LK.getScore());
+					if (Math.random() < 0.0667) {
+						var shootingPowerUp = new ShootingPowerUp();
+						shootingPowerUp.x = self.x;
+						shootingPowerUp.y = self.y;
+						game.addChild(shootingPowerUp);
+					}
+					self.destroy();
+					aliens.splice(aliens.indexOf(self), 1);
+				}
+				heroBullets[i].destroy();
+				heroBullets.splice(i, 1);
+				break;
+			}
+		}
 	};
 });
 // Define the HeroBullet class
 var HeroBullet = Container.expand(function () {
@@ -374,62 +415,8 @@
 			heroBullets[k].destroy();
 			heroBullets.splice(k, 1);
 		}
 	}
-	// Collision detection between hero bullets and aliens
-	for (var l = heroBullets.length - 1; l >= 0; l--) {
-		for (var m = aliens.length - 1; m >= 0; m--) {
-			if (heroBullets[l].intersects(aliens[m])) {
-				// Decrease alien health and check if it should be destroyed
-				aliens[m].health--;
-				if (aliens[m].health <= 0) {
-					// Update score for destroying an alien
-					LK.setScore(LK.getScore() + 100);
-					scoreDisplay.updateScore(LK.getScore());
-					// Chance to drop a life power-up
-					if (Math.random() < 0.0667) {
-						// 1 in 15 chance
-						var shootingPowerUp = new ShootingPowerUp();
-						shootingPowerUp.x = aliens[m].x;
-						shootingPowerUp.y = aliens[m].y;
-						game.addChild(shootingPowerUp);
-					}
-					aliens[m].destroy();
-					aliens.splice(m, 1);
-				}
-				// Destroy the hero bullet
-				heroBullets[l].destroy();
-				heroBullets.splice(l, 1);
-				break;
-			}
-		}
-	}
-	// Collision detection between space ranger and meteors/aliens
-	for (var n = 0; n < meteors.length; n++) {
-		if (spaceRanger.intersects(meteors[n])) {
-			spaceRanger.lives--;
-			livesDisplay.updateLives(spaceRanger.lives);
-			LK.effects.flashScreen(0xff0000, 500);
-			if (spaceRanger.lives <= 0) {
-				LK.showGameOver();
-				return;
-			}
-			meteors[n].destroy();
-			meteors.splice(n, 1);
-		}
-	}
-	for (var o = 0; o < aliens.length; o++) {
-		if (spaceRanger.intersects(aliens[o])) {
-			spaceRanger.lives--;
-			LK.effects.flashScreen(0xff0000, 500);
-			if (spaceRanger.lives <= 0) {
-				LK.showGameOver();
-				return;
-			}
-			aliens[o].destroy();
-			aliens.splice(o, 1);
-		}
-	}
 	// Pick up ShootingPowerUp
 	for (var p = 0; p < game.children.length; p++) {
 		var obj = game.children[p];
 		if (obj instanceof ShootingPowerUp && spaceRanger.intersects(obj)) {
@@ -457,27 +444,10 @@
 		for (var i = 0; i < waveEnemyCount; i++) {
 			var randomTypeIndex = Math.floor(Math.random() * enemyTypes.length);
 			var EnemyClass = enemyTypes[randomTypeIndex];
 			var newEnemy = new EnemyClass();
-			// Ensure new enemies do not overlap with existing enemies
-			var positionFound = false;
-			while (!positionFound) {
-				newEnemy.x = Math.random() * 2048;
-				newEnemy.y = -newEnemy.height / 2;
-				positionFound = true;
-				for (var j = 0; j < meteors.length; j++) {
-					if (newEnemy.intersects(meteors[j])) {
-						positionFound = false;
-						break;
-					}
-				}
-				for (var k = 0; k < aliens.length; k++) {
-					if (newEnemy.intersects(aliens[k])) {
-						positionFound = false;
-						break;
-					}
-				}
-			}
+			newEnemy.x = Math.random() * 2048;
+			newEnemy.y = -newEnemy.height / 2;
 			game.addChild(newEnemy);
 			if (newEnemy instanceof Meteor) {
 				meteors.push(newEnemy);
 			} else {