That description concisely describes this charming little rhythm game. Mevo and The Grooveriders is presented as a side-scrolling platformer in which your controls consist of two buttons that must be tapped in time with the music. Mevo runs and jumps across the level on his own and your taps must be timed as he runs past the corresponding icons. Miss a note and Mevo will stumble. Miss enough and the game ends.
It's really a hypnotic experience that should please most fans of rhythm gaming, and I suspect just watching this video will cause some people to instantly buy the game no matter what else I might say:
There is one caveat, however, and that's the game's length. The 7+ minute video above actually shows the entire game on the iPhone as it stands now -- 3 levels (though there are 3 levels of difficulty to play across). The developer has said that they are planning on porting over the remaining levels from the PC version (15 in all) over to the iPhone and that they will be free updates.
Still, the game is only $0.99, so it's not much of an investment to simply get it now.
App Store Link: Mevo and The Grooveriders, $0.99