This game just isn't right. The main issue I have is that there is a huge delay between pressing fire, and actually shooting your beam. It really ruins the experience. The Wii version, where this is ported from, has no delay at all. Now, you're not getting the game for $1 on the Wii version like you are for the winter sale, but it is SO much better than this game. If anything, I recommend picking up a copy of Bit.Trip Complete on the Wii for about $20. It includes all 6 games in the main series, fun extras, and it includes the true story of the Bit.Trip games. It's a great buy.
SO, final results:
Wii Version- Very fun and challenging for all the right reasons! Recommended, 8/10!
PC Version- Kind of fun, and challenging for all the wrong reasons. Not recommended, 4/10
Bit.Trip Complete- ABSOLUTELY worth your money, 9/10