Attacking mulitple targets simultanously

Hi Pros,

i am a newbie hobby programmer since 6 month and i love it. I tryed right now a Tower def game with a good tutorial and just wanted to add some extra stuff to train my skills. Right now the towers just attack one enemy if he is dead or out of range they target the next.

I want to add a tower that can attack all enemys. I tried it with an new list in wich i add all enemys that enter the collider, and with a foreach loop i wanted to set them as targets. If i read the logs thos works but my damn tower doenst want to attack simultaneously. He attacks the enemys right one after another. Any tipps would be great and dont be to harsh with me, just learning tight now :D thx for help :)

 MonoBehaviour { [SerializeField] private string projectileType;
 
   [SerializeField]
   private int damage;
  
   private Monster target;
  
   private bool canAttack = true;
  
   private float attackTime;
  
   List<Monster> attackList = new List<Monster>();
  
   [SerializeField]
   private Animator animator;
  
   [SerializeField]
   private float attackCooldown;
  
   [SerializeField]
   private float projectileSpeed;
  
   public int MyPrice { get; set; }
  
   public float MyProjectileSpeed { get => projectileSpeed; set => projectileSpeed = value; }
   public Monster MyTarget { get => target; set => target = value; }
   public int MyDamage { get => damage; set => damage = value; }
  
   // Start is called before the first frame update
   void Start()
   {
  
   }
  
   // Update is called once per frame
   void Update()
   {
       SetTarget();
       Attack();
   }
  
    
   public void SetTarget()
   {
       if(target == null && attackList.Count > 0)
       {
           foreach (Monster monster in attackList)
           {
               target = monster;
               Debug.Log(monster);
             
           }
       }
  
   }
  
   public void Attack()
   {
  
       if (target != null && target.IsActive)
       {
           Shoot();
       }
  
       if (target != null && !target.IsAlive || target != null && !target.IsActive)
       {
           target = null;
       }
   }
   private void Shoot()
   {
  
       Projectile projectile = GameManager.MyInstance.MyPool.GetObject(projectileType).GetComponent<Projectile>();
       projectile.transform.position = transform.position;
       projectile.Initialize(this);
  
  
  
   }
  
   public void OnTriggerEnter2D(Collider2D other)
   {
       if (other.tag == "Monster")
       {
  
           attackList.Add(other.GetComponent<Monster>());
           Debug.Log(MyTarget);
       }
   }
  
   public void OnTriggerExit2D(Collider2D other)
   {
       if (other.tag == "Monster")
       {
           attackList.Remove(other.GetComponent<Monster>());
           target = null;
  
       }
   }
  
  
   
 }