void Start()
{
if (instance != null)
{
throw new UnityException("instance not null");
}
else
{
instance = this;
}
pauseMenu.gameController = this;
introSequence.gameController = this;
objectPools = new List <ObjectPool>();
playArea.Initialize();
LoadDifficulty();
LoadCurrentStageName();
LoadPools();
LoadPlayers();
enemySystem.Initialize(players);
gui.InitScoreGUI(scoreSystem, currentStage);
gui.gameObject.SetActive(false);
pauseMenu.gameObject.SetActive(false);
introSequence.StartIntroSequence();
Debug.Log("TODO, prewarm pools"); //TODO prewarm pools
}
