void Start()
 {
     gameplayUI.SetActive(true);
     resultsScreen.SetActive(false);
     if (ScriptLevelRatings.currentLevel == 5 || ScriptLevelRatings.GetCurrentLevelRating() == 0)
     {
         nextLevelButton.interactable = false;
     }
     if (cannon == null)
     {
         cannon = GameObject.FindGameObjectWithTag("Cannon").GetComponent <ScriptCanon>();
     }
 }