The final boss fight really got me cranking it took me a long time to beat that but that what I like about boss fights they put up a challenge and you guy('s) put the challenge in that boss fight. Also that bonus level (secret mission) is super scary and fun, the feeling of finding two of the skulls in complete darkness and in the meantime being hunted it reminds me of aliens. I would recommend this game and I will definitely buy the full version.