This should hold you over until GH3
First of all, this is not the first game to utilize an inverted keyboard in this fasion. Ever hear of "Frets on Fire"? It uses the same controls. Though not the most original game, it's a lot of fun to play, with a good control scheme and a good amount of songs. The songs are good (though they aren't well known by any means, with the exception of a few you'll recognize from games such as F-zero and Legend of Zelda). The graphics, however, the background and animations, could be better, though for a rhythm game, it disen't take much. Also, it would be nice if there was an ending of some sort, and if they showed your best score next to each song on the setlist.