@Samster, done on keyboard. It just takes some time to get used to the control scheme. I don't really condider myself being that great on rhythm games, I just got addicted and continued playing.
I think that some scores in advanced mode should be revised; at least World 3 scores. With some perfect play you can get the silver medal in time (120 s) but that's really about it. Also silver in switches is achievable (60) but after that (45) it's just unreasonable and I'm not even sure if it's possible. -- I can't really think of other scores as I lost my save data and can't check them atm.
As my favourite things in gaming are platforming and optimizing scores, this game seems like it has been done for me. =D
Also, is there a reason why my highscore for medals collected has been deleted? I'm at 96 medals atm.