Enemy Spawner

EnemySpawner.cs

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class EnemySpawner : MonoBehaviour
{

    public List<GameObject> spawnPoints = new List<GameObject>();
    public GameObject enemy;

    int randSpawnPoint;
    float timer;
    public float spawnDelay = 1f;
    void Update()
    {
        timer += Time.deltaTime;

        if (timer > spawnDelay)
        {
            randSpawnPoint = Random.Range(0, spawnPoints.Count);
            GameObject enemyInstance =  Instantiate(enemy, spawnPoints[randSpawnPoint].transform.position, Quaternion.identity);
            enemyInstance.transform.parent = null;
            timer = 0;

        }
    }
}