This game is awesome, the controls are tight and keyboard/mouse very usable which is unusual for a 3d platformer. The dialogue is hilarious in addition to many amusing tidbits spread through the world. Soundtrack is over 5 hours long and I love almost all of it. It would be good if the soundtrack where available without buying the game as it stands well by itself. If you aren't getting it due to lack of a Linux port, the game is almost flawless under wine.
