[copied from my Steam review]

This is pretty much a novelty game. Play it once, get fascinated, finish it at least to some extent, and then forget it. I had my "wow" experience during the first time playing the game, and the rhythm as part of the game mechanic is quite a fun novelty, which makes for some rather interesting extensions to the standard platforming and boss fights. But now after so many years it just sits in my library and feels like a hollow memory of something that I now really want to replace with something that is much more fulfilling than this.

Certainly worth the money for such a low price, though.