Let me know if there are any puzzles you guys are suffering with. I found a systematic way to hack the game's stats at least for me. I've beaten all the levels except for the waterfall level (if only because I already beat it in previous versions I can't be bothered to do it again). I also don't think your supposed to be able to beat the boss at the fifth level because there's no dialogue after it and the boss becomes untouchable to everything except your very limited range weapons.