Full scene restart

Hey guys, so I got this small game I am working on and I am using PoolManager, I am not getting any errors but when I use my restart button using this code…

using UnityEngine;
using System.Collections;

public class FullRestart : MonoBehaviour 
{
	void OnClick()
	{
		Application.LoadLevel ("Level_1");
	}
}

I am not getting it to again start the enemies to spawn, they don’t spawn ever again and I am not getting any error. The code for my spawning enemies is this and its set to false until I press a button in game…

using UnityEngine;
using System.Collections;
using PathologicalGames;

public class EnemySpawning : MonoBehaviour 
{
	public float spawnTime = 3.0f;
	float timeLeft = 0.0f;
	public static bool isSpawning = false;
	
	public Transform español = null;
		
	void Update () 
	{
		if (isSpawning != false)
		{
			timeLeft -= Time.deltaTime;
			if (timeLeft <= 0.0f) 
			{
				Transform t = PoolManager.Pools["Enemy"].Spawn(español, transform.position, Quaternion.identity);
				
				timeLeft = spawnTime;
			}
		}
		
	}
}

So if you guys ever faced a problem like this please I would love to get some help, thank you all in advance!

I had the same problem, and this simple code insert fixed it for me:

 public void Awake()
    {
        Time.timeScale = 1;
    }