Hmm...the video quality ain't great, but I get the idea. It's pretty cool, actually, that they seem to be trying to do something at least a little different than most of what's out there for this genre. The first song you played instantly reminded me of Taiko no Tatsujin, but the other two were definitely something different, though not necessarily all that appealing. Of course, you can't always tell if something's fun or not just by watching a video.
I'll definitely check the game out at some point. Any critical impressions you'd like to convey about the game?