Touch - Linecast collision detection

Hey guys,

I'm trying to implement a functionality, that detects an intersection(collision) between a swipe and a GameObject in 2D. Kinda like in the game Cut The Rope. So I have multiple GameObjects in my scene. And when I swipe I want to record the first GameObject that I intersect with. My code right now looks like this:

       public GameObject obj;
       private Vector2 pos1;
       private RaycastHit2D hit;
     
       void Update()
       {
             if (Input.touchCount > 0)
             {
                 var touch = Input.GetTouch(0);
                 switch (touch.phase)
                 {
                     case TouchPhase.Began:
                              pos1 = Camera.main.ScreenToWorldPoint(touch.position);
                              break;
     
                     case TouchPhase.Ended:
                              RaycastHit2D hit = Physics2D.Linecast(pos1,  Input.GetTouch(0).position);
                              if (hit.collider)
                              {
                                      obj.GetComponent<Text>().text =
                                          obj.GetComponent<Text>().text + hit.collider.name;
                              }
                      break;
                 }
             }
         }

The problem is, that this doesnt seem to be accurate and it doesnt work, if I swipe vertically. What am I doing wrong? I'm not even sure, if this is the right approach :S.