Finally got around to beating the game. The last levels were awesome, the lava levels in particular. The lava level music, the atmosphere and the platforming for level 9 was bad ass.
I've been playing a little bit today and can attest that it works completely on WINE for Ubuntu. Sound's a little hit-and-miss, though.
It's a very nice game! Enjoyable gameplay and pretty visuals all around, with a substantial atmosphere to back it up. My one wish is that the attack move was sustained as long as the action button was held down.