lilt line ($2.99 > FREE)
The game wasn't free since 2010. Very good music rhythm game, although it is all dubstep (as far as I can remember) so I can understand it is not for everyone. The video below is from Wii version of the game.
Favorites: The Quest Gold + expansions, Mission Europa Collectors Edition, Ascension, Jet Car Stunts 2, Junk Jack X, King of Dragon Pass, Kingturn series, Mecho Wars HD, Mini Dash, Mos Speedrun, Ravenmark, Sonic series, Fall of Angels, Highborn, Solomonís Keep / Boneyard, pixel art games, remakes and ports of classic games.