this is my pause menu script but it doesn't pause my game or neither the pause menu disappear however restart works fine

using UnityEngine; using System.Collections;

public class PauseMenu : MonoBehaviour {

 public GameObject PauseUI;

 private bool paused = false;

 void start()
 {
     PauseUI.SetActive (false);
 }

 void update()

 {
     if(Input.GetButtonDown("Pause"))
     
     {
         paused = !paused;
     }

     if(paused)
     
     {
         PauseUI.SetActive (true);
         Time.timeScale = 0;
     }

     if(!paused)
     
     {
         PauseUI.SetActive (false);
         Time.timeScale = 1;
     }
     
 }

 public void Resume ()

 {
     paused = false;
 }

 public void Restart ()

 {
     Application.LoadLevel (Application.loadedLevel);
 }

 public void Quit ()

 {
     Application.Quit ();
 }

 public void MainMenu ()

 {
     Application.LoadLevel (0);
 }

}