**MOTION SICKNESS WARNING**
Let's just get that right away out front. I usually do not suffer from motion sickness in video games. But the stark contrast of dark colors rotating rapidly, back and forth, on a white background was enough to make even my eyes and stomach cry mercy after little more than half an hour of play. If you do suffer from motion sickness easily, than this is simply not the game for you.
However, if you aren't subject to that, or play the game in small doses, then this is a pretty fun musical avoidance game. Not unique, but well put together. The music choices are solid. It's easier with a mouse, but there's option to use a controller as well if you have one. There's plenty of songs to unlock, and simply playing through a song once unlocks "Zen mode" where you can basically just have the song play through and not worry about being hit.
One other part that can be annoying for some: The game likes to mess with timing. The things you're trying to dodge can slow down, or speed up, or even reverse, depending on the music. This does make things more challenging. It's somewhat frustrating, because an integral part of dodging is being able to time things. On the other hand, it does make for a bit more uniqueness in the game, and makes it just a little more challenging in those moments.
Pick the game up when it's on sale, but grab the soundtrack too - though it only has about half the songs.