2D C# top down shooter, adjusting the projectiles angle

Hello, so im as my first game trying to make a 2d top down shooter. I have a projectile (an arrow) that my character shoots but I have problem making this arrow point towards the direction I'm shooting. The player character is not turning at all in this game.

 public class Fire : MonoBehaviour
 {
     public GameObject projectile;
     public float fireRate = 2f;
     private float nextFire = 0f;
     private Vector3 target;
 
     void Start()
     {
         target = transform.position;
     }
 
     void Update()
     {
         GameObject projectileObject;
 
         if (Input.GetButton("Fire1") && Time.time > nextFire && Time.timeScale == 1)
         {
             nextFire = Time.time + fireRate;
 
             target = Camera.main.ScreenToWorldPoint(Input.mousePosition);
 
             Quaternion rotation = Quaternion.LookRotation(target - transform.position, Vector3.forward);
             Quaternion targetRotation = new Quaternion(0, 0, rotation.z, rotation.w);
 
             projectileObject = Instantiate(projectile,
                                 new Vector2(transform.position.x + 0.4f, transform.position.y + 0.2f),
                                 targetRotation) as GameObject;
         }
     }
 }

I want to get the angle from the player (transform) to the position where I click (target) and then set the angle of the arrow.

The current solution you see above does change the angle of the arrow depending on where I aim but not correctly.