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unity/Assets/2.5D Engine/Scripts/EnemySpawner.cs

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+using UnityEngine;
+namespace IndianOceanAssets.Engine2_5D
+{
+    // Spawns enemies at random positions and intervals
+    public class EnemySpawner : MonoBehaviour
+    {
+        [SerializeField]
+        private GameObject enemyEntity; // Enemy prefab
+
+        [SerializeField]
+        private Transform[] spawnPosition; // Possible spawn points
+
+        [SerializeField]
+        private float spawnTime = 4f; // Time between spawns
+
+        // Starts repeated spawning
+        private void Start()
+        {
+            InvokeRepeating("SpawnEnemies", 0f, spawnTime);
+        }
+
+        // Spawns a random number of enemies at random positions
+        public void SpawnEnemies()
+        {
+            int enemyNo = Random.Range(1, 4);
+
+            for (int i = 0; i < enemyNo; i++)
+            {
+                int randomSpawnPosition = Random.Range(0, spawnPosition.Length);
+
+                if (spawnPosition[randomSpawnPosition])
+                {
+                    // Randomize spawn position slightly
+                    Vector3 randomUnitCircle = new Vector3(Random.Range(-1f, 1f), .5f, Random.Range(-1f, 1f));
+                    Instantiate(enemyEntity, spawnPosition[randomSpawnPosition].position + randomUnitCircle, Quaternion.identity);
+                }
+            }
+
+            // Decrease spawn time to increase difficulty, but not below 2 seconds
+            spawnTime -= .5f;
+
+            if (spawnTime <= 2f)
+                spawnTime = 2f;
+        }
+    }
+}