Movement interpolation

Hi guys,

I'm trying to create a 2d game, where a cube move towards a tap (using FingerGesture, amazing API :D). I've create the cube and the tap code, but the object jumps on spot instantaneously. Can figure out what I'm missing...

     using UnityEngine;
 
 public class LookAtTap : MonoBehaviour {
 
     public float height = 0.5f;
     public float velocity = 0.5f;
 
     
 
     
     // reference to our tap gesture recognizer object
     public TapGestureRecognizer tapRecognizer;
  
     void Start()
     {
         
         // register to the tap recognizer's OnTap event
         tapRecognizer.OnTap += tapRecognizer_OnTap;
     }
           
     
     // our tap event handler method
     void tapRecognizer_OnTap( TapGestureRecognizer source )
     {
         rotateTarget(source.Position);
         moveTarget(source.Position);
         Debug.Log( "Source position " + source.Position);
 
     }
     
     void moveTarget(Vector2 MoveTarget)
     {
         
         Vector3 targetNewPosition;
             
         targetNewPosition.x = MoveTarget.x; 
         targetNewPosition.y =    height;
         targetNewPosition.z    = MoveTarget.y;
 
                 //movement interpolation
                 transform.position = Vector3.Lerp(transform.position, targetNewPosition, velocity) ;
         
         Debug.Log( "Target position " + MoveTarget);
          
         
     }
     
     void rotateTarget(Vector2 Target)
     {
         Vector3 rotTarget;
         
         rotTarget.x = Target.x;
         rotTarget.y = 0;
         rotTarget.z = Target.y;
         var relativePos = rotTarget - transform.position;
         Quaternion rotation = Quaternion.LookRotation(relativePos);
         transform.rotation = rotation;
          
         
     }
 }