I really love the concept and how the story is full of mystery and funny scenes!
I would like to know more about R-0 :3
For a rhythm game, songs are quite good and sounds high-bitrate quality. I couldn't figure out how to properly set the timing adjustment though, as it seems to get everything relative to the current setting, etc.
Sad that it doesn't seem to receive updates anymore though, despite still being online for more or less a year w/o updates.