unity 2d how to keep spawing enemies code example

Example: spawner unity 2d

using UnityEngine;

public class Spawner : MonoBehaviour
{
	public GameObject Object;
	float timebtwspawn;
	public float startTimeBtwSpawn;
    void Update()
    {
			if (timebtwspawn <= 0)
			{
				Instantiate(Object, transform.position, Quaternion.identity);
			}
			else
			{
				timebtwspawn -= Time.deltaTime;
			}
		}
	}