public void UpgradeMe()
 {
     int currentLevelIndex = levels.IndexOf(currentLevel);
     if (currentLevelIndex < levels.Count - 1)
     {
         if (GameObject.Find ("GoldCounter").GetComponent<GoldCounter>().Gold >= currentLevel.myUpgradeCost)
         {
             GameObject.Find ("GoldCounter").GetComponent<GoldCounter>().Gold -= currentLevel.myUpgradeCost;
             CurrentLevel = levels[currentLevelIndex + 1];
         }
     }
 }
 void OnEnable()
 {
     CurrentLevel = levels[0];
 }