@Arcanod I don't think many people agree with your comment - after all, you didn't write games with higher rating, so I don't think that you have a right to criticise the game that strong.
This game has a fake difficulty... And it's unbeatable at first try, if you don't know that there's no shop or healing for first 9 or so levels.
http://tvtropes.org/pmwiki/pmwiki.php/Main/FakeDifficulty