===================================================================
--- original.js
+++ change.js
@@ -182,23 +182,35 @@
 			LK.showGameOver();
 			return;
 		}
 	}
-	// Spawn meteors and aliens
-	if (LK.ticks % 120 == 0) {
-		var newMeteor = new Meteor();
-		newMeteor.x = Math.random() * 2048;
-		newMeteor.y = -newMeteor.height / 2;
-		meteors.push(newMeteor);
-		game.addChild(newMeteor);
+	// Initialize wave properties
+	var waveCount = 1;
+	var waveInterval = 600; // Initial interval for spawning waves
+	var enemiesPerWave = 5; // Initial number of enemies per wave
+	// Spawn enemies in waves
+	if (LK.ticks % waveInterval === 0) {
+		for (var i = 0; i < enemiesPerWave; i++) {
+			var enemyTypes = [Meteor, Alien, EnemyType1, EnemyType2, EnemyType3, EnemyType4, EnemyType5];
+			var randomTypeIndex = Math.floor(Math.random() * enemyTypes.length);
+			var EnemyClass = enemyTypes[randomTypeIndex];
+			var newEnemy = new EnemyClass();
+			newEnemy.x = Math.random() * 2048;
+			newEnemy.y = -newEnemy.height / 2;
+			game.addChild(newEnemy);
+			if (newEnemy instanceof Meteor) {
+				meteors.push(newEnemy);
+			} else {
+				aliens.push(newEnemy);
+			}
+		}
+		// Increase the number of enemies for the next wave
+		enemiesPerWave += Math.floor(waveCount * 0.5);
+		// Decrease the interval between waves to a minimum of 300 ticks
+		waveInterval = Math.max(300, waveInterval - 50);
+		// Increment wave count
+		waveCount++;
 	}
-	if (LK.ticks % 240 == 0) {
-		var newAlien = new Alien();
-		newAlien.x = Math.random() * 2048;
-		newAlien.y = -newAlien.height / 2;
-		aliens.push(newAlien);
-		game.addChild(newAlien);
-	}
 	// Fire hero bullets
 	if (LK.ticks % 30 == 0) {
 		var newHeroBullet = new HeroBullet();
 		newHeroBullet.x = spaceRanger.x;