Touch controls

I want to have a button to move my character for touch controls.

Like that on the bottom left corner of the image

I have the following code but it does not move the button at all. It works ok when i use mouse input instead of touch. What do i do wrong?

 using UnityEngine;
 using System.Collections;
 
 public class mobile_control : MonoBehaviour {
     private int initx = 100;
     private int inity = Screen.height-70; 
     Rect buttonRect;
     bool buttonPressed = false;
     private int MaxClampX;
     private int MinClampX;
     private int MaxClampY;
     private int MinClampY;
     void Start(){
         buttonRect = new Rect (initx,inity, 40, 40);
         MaxClampX = initx + 80;
         MinClampX = initx - 60;
         MinClampY = inity;
         MaxClampY = inity - 60;
     }
     void OnGUI()
     {
         if(Input.touchCount > 0){
             if(Input.GetTouch(0).position.x<200 && Input.GetTouch(0).position.y > Screen.height - 200)
             {
                 buttonPressed = true;
             } else {
                 buttonPressed = false;
                 if(buttonRect.y<inity) buttonRect.y +=2;
                 if(buttonRect.y>=inity) buttonRect.y = inity;
                 if(buttonRect.x>initx+6) buttonRect.x -=2;
                 if(buttonRect.x<initx-6) buttonRect.x +=2;
             }
             
             if(buttonPressed && Input.GetTouch(0).phase == TouchPhase.Moved)
             {
                 Vector2 tdelta = Input.GetTouch(0).deltaPosition;
                 if(!(buttonRect.x+tdelta.x>=MaxClampX || buttonRect.x+tdelta.x<=MinClampX))
                     buttonRect.x += tdelta.x;
                 if(!(buttonRect.y+tdelta.y<=MaxClampY || buttonRect.y+tdelta.y>=MinClampY))
                     buttonRect.y += tdelta.y;
                 if(buttonRect.x>initx+10){
                     Debug.Log("Forward");
                     if(buttonRect.x>initx+60){
                         Debug.Log("Run");
                     }
                 }
                 if(buttonRect.x<initx-10){
                     Debug.Log("Backward");
                 }
                 if(buttonRect.y<inity-30){
                     Debug.Log("Jump");
                 }
             }
         } else {
             if(buttonRect.y<inity) buttonRect.y +=2;
             if(buttonRect.y>=inity) buttonRect.y = inity;
             if(buttonRect.x>initx+6) buttonRect.x -=2;
             if(buttonRect.x<initx-6) buttonRect.x +=2;
         }
         GUI.Button(buttonRect, "X");
     }
 }