void MakeEnemiesAlerted()
    {
        EnemyAI[] allEnemies = FindObjectsOfType <EnemyAI>();

        for (int i = 0; i < allEnemies.Length; i++)
        {
            EnemyAI thisEnemy = allEnemies[i];
            if (thisEnemy != null && Vector2.Distance(transform.position, thisEnemy.transform.position) < alertRange)
            {
                // Buff enemies

                thisEnemy.ChangeStats(10, 90, thisEnemy.alertedSpeed);
                thisEnemy.gfx.gameObject.GetComponent <SpriteRenderer>().color = Color.yellow;   // Cambiar color del sprite
                thisEnemy.gun.GetComponentInChildren <SpriteRenderer>().color  = Color.yellow;   // Cambiar color del sprite de la pistola
            }
        }
    }