space shooter tutorial, ending the game

Hello all

This is my first time posting here, so sorry if my question is dumb, or obvious.

I am currently running through the space shooter tutorial on the unity website. It's a great tutorial and I have really enjoyed making the game, I am now on the penultimate part, titled "Ending The Game", as far as I can tell I my code is right and everything else is too. Although obviously something is wrong.

I am trying to set up an end to the loop and to make the game restart on the press of the 'R' button.

Here is my GameController script

using UnityEngine; using System.Collections;

public class GameController : MonoBehaviour {

 public GameObject hazard;
 public Vector3 spawnValues;
 public int hazardCount;
 public float spawnWait;
 public float startWait;
 public float waveWait;
 
 public GUIText scoreText;
 public GUIText restartText;
 public GUIText gameOverText;
 
 private bool gameOver;
 private bool restart;
 private int score;
 
 
 void Start ()
 {
     gameOver = false;
     restart = false;
     restartText.text = "";
     gameOverText.text = "";
     score = 0;
     UpdateScore ();
     StartCoroutine (SpawnWaves ());
 }
 
 void Update ()
 {
     if (restart) 
     {
         if (Input.GetKeyDown(KeyCode.R))
         {
             Application.LoadLevel(Application.loadedLevel);
         }
         
     }
 }
 
 IEnumerator SpawnWaves ()
 {   
     yield return new WaitForSeconds (startWait);
     while (true)
     {
         for (int i = 0; i < hazardCount; i++) 
         {
             Vector3 spawnPosition = new Vector3 (Random.Range (-spawnValues.x, spawnValues.x), spawnValues.y, spawnValues.z);
             Quaternion spawnRotation = Quaternion.identity;
             Instantiate (hazard, spawnPosition, spawnRotation);
             yield return new WaitForSeconds (spawnWait);
         }
         yield return new WaitForSeconds (waveWait);
         
         if (gameOver)
         {
             restartText.text = "Press 'R' for Restart";
             restart = true;
             break;
         }
     }
 }
 
 public void AddScore (int newScoreValue)
 {
     score += newScoreValue;
     UpdateScore ();
     
 }
 
 void UpdateScore ()
 {
     scoreText.text = "Score: " + score;
     
 }
 public void GameOver ()
 {
     gameOverText.text = "Game Over!";
     gameOver = true;
 }

}

and here is my DestroyByContact script:

 using UnityEngine;
 using System.Collections;
 
 public class DestroyByContact : MonoBehaviour 
 {   
     public GameObject explosion;
     public GameObject playerExplosion;
     public int scoreValue;
     private GameController gameController;
     
     void Start ()
     {
         GameObject gameControllerObject = GameObject.FindWithTag("GameController");
         if (gameControllerObject != null)
         {
             gameController = gameControllerObject.GetComponent <GameController>();    
         }
         if (gameController == null) 
         {
             Debug.Log("Cannot find 'GameController' script");
             
         }
     }
     
     void OnTriggerEnter(Collider other) {   
         if(other.tag == "Boundary") 
         {
             return;
         }
         Instantiate (explosion, transform.position, transform.rotation);
         if (other.tag == "player") 
         {
             Instantiate(playerExplosion, other.transform.position, other.transform.rotation); 
             gameController.GameOver ();
         }
         gameController.AddScore (scoreValue);
         Destroy(other.gameObject);
         Destroy(gameObject);
     }
     
 }

Any help would be very much appreciated.

All the best

Harry