Just threw this on my CycloDS to check it out. Pretty nice! Kinda funny that Ninty themselves didn't think of this.....using midi tunes as opposed to actual songs so you could have a larger variety of music in one rhythm game while taking up a hell of a lot less space.
I should contribute to the bounty just to vote for this. I just might do that. I mean, other than a few PC games that were "homebrew-ported" to, or "homebrew-remade" for the DS (Lemmings, Tyrian, DScent, Doom, etc.) I was never too impressed with many of the homebrew games (I consider homebrew utilities and emu's something completely different). Most homebrew games always just seemed amateurish, poorly conceived, not fun, too short or simplistic to me for the most part. This is VERY well done and the fact that it has a few dozen tunes to go through, in multiple difficulty levels, actually puts many REAL DS games to shame, let alone other homebrew efforts.
So far, this game looks like a shoe-in for the first place Homebrew Bounty winnings. In fact, this game should be on store shelves next to the official rhythm games.
Kudos to sumiguchi and spriteattack for such a AAA entry! You guys gonna get some cash!