void StartGame()
{
Assert.That(_state == GameStates.WaitingToStart || _state == GameStates.GameOver);
_aliensCatched = 0;
_bestAliensCatched = PlayerPrefs.GetInt("aliens");
_asteroidSpawner.Start();
_hook.ChangeState(HookStates.Waiting);
_hook.ChangeState(HookStates.Moving);
_state = GameStates.Playing;
}