Shump Touch Control

Hello Everyone!

I'm trying to do a Shump mobile game, and I downloaded some games from Google play like: BladeZ, Galaxy Aircraft, Galaxy Under Fire.

And I noted that all these games implement the same touch control (Which I found it perfect). You touch in any part of the screen, and if for example you swipe up, the airship moves up, is 8 direction.

SO, I'm trying to do this same control for my game, but is not working, can someone give me some guidelines?

This is whay I have so far:

 Vector2 startPos;
 Vector2 direction;
 
 if (Input.touchCount > 0) {
             Touch touch = Input.GetTouch(0);
 
             switch (touch.phase) {
             case TouchPhase.Began:
                 startPos = touch.position;
                 break;
 
             case TouchPhase.Moved:
                 direction = touch.position - startPos;
 
                 if (direction.x<startPos.x){
                     Vector2 pos=gameObject.GetComponent<Rigidbody2D>().position;
                     pos.x-=0.1f;
                     gameObject.GetComponent<Rigidbody2D>().position=pos;
                 }else if(direction.x>startPos.x){
                     Vector2 pos=gameObject.GetComponent<Rigidbody2D>().position;
                     pos.x+=0.1f;
                     gameObject.GetComponent<Rigidbody2D>().position=pos;
                 }
 
                 Debug.Log("Direction: "+direction);
                 break;
 
             }
         }

But is not working, any help is appreciated.

Thanks in advance!