An attempt at a rhythm game with an actually decent story, but ultimately the only thing that challenges the player is the gluttered screen and how the timing of the button presses switches between beat, vocalist phrasing, lead instruments or some other arbitrary instrument - that is if you're playing the songs that come with the game, your own collection of music is a totally different and much more depressing story.
There's a very limited amount of different combinations of button pressing sequences that the game throws at you - 1, 2 or three in a row, 1, 2 or 3 at a time and press & hold, possibly double tapping on some (pretty much required on master difficulty if you want to keep your combo going). There's no stream of notes kind of things that I loved from DDR/ITG.
Button pressing timing seems about on-par with ITG/stepmania, but the fact that they're often using a part of a song for the notes that doesn't make any sense and it can mess up rhythm especially when it suddenly jumps to following vocalist phrasing. This wouldn't be that bad if the screen had any sort of indication of the actual rhythm like with colours that previously mentioned games does, but there's only 3 colours, red (double/triple hits), yellow (singles "on beat") and blue ("stream" (2 or 3 in a row)), nothing to indicate rhythm at all. Listening to it wouldn't be that bad but again, the jumping suddenly to another aspect of the song throws you off unless you're intimately familiar with the sequence - oh, and don't bother memorizing anything but the "rhythm", they randomize the sequences on master difficulty, only keeping the "rhythm" constant every time you play the same song.
Play your own song feature is even more useless than in Audiosurf. You have to tap the beat and set a beat start position with millisecond accuracy (which is pretty much impossible) by hand. Songs cut off at 6 minutes, still can't play Art of Life or anything like that. There's a very limited file format support, don't even dream about FLAC.
And when you finally get to play a song, the button sequence has absolutely nothing to do with anything in the song, except possibly the beat if you managed to tweak the right values in.
I did collect all the achievements in this game and there was one that probably took me about 45-50 hours to get, but in the end it was just about staying concentrated for about an hour of songs with one non-resetting health bar.
I would not recommend this game to seasoned rhythm game players, it's just too easy. The story is nice though so if it's on sale it can be a fun few hours.