/// <summary>
/// Loads all levels into the level manager.
/// </summary>
private void LoadLevels()
{
_levelManager = new LevelManager();
_meteorFactory = new MeteorFactory(_entityManager, _game);
_levelFactory = new MeteorLevelFactory(_entityManager, _meteorFactory, _game);
_levelManager.EnqueueLevel(_levelFactory.CreateLevel(LevelDifficulty.EASY));
_levelManager.EnqueueLevel(_levelFactory.CreateLevel(LevelDifficulty.NORMAL));
_levelManager.EnqueueLevel(_levelFactory.CreateLevel(LevelDifficulty.HARD));
}