// Use this for initialization
 void Start()
 {
     survivalTime  = Random.Range(minSurvivalTime, maxSurvivalTime);
     survivalTimer = survivalTime;
     timerUI       = GameObject.Find("Timer").GetComponent <TimerUI>();
     if (timerUI != null)
     {
         timerUI.SetTimer(survivalTime);
     }
     if (AudioManager.instance)
     {
         AudioManager.instance.PlaySound("Music");
     }
     levelStatus = LevelStatus.IN_PROGRESS;
 }