Awesome game. I like the effort put into each and every level. I can't imagine how long it would take for you to make sure every single level was non-exploitable :P Good job ^^
Why did you even bother uploading it while it's so broken? You should have at least removed the worst of the bugs or made it semi-playable, but it's just so glitchy and unfriendly right now I'm not even going to bother getting past level 10.
(3/5) Ok, right off the bat, MASSIVE abuse of long notes, if you have to use them at all, make it interesting by sticking a few 'normal' notes in there at the same time. Secondly, the notes seem to make no sense at all. "Dun dun du du du" seems to be "___ ___ du __ du" in all modes, which makes me feel as if I'm just playing a game with music in the background rather than actually playing the instrument (which is what you want). I greatly liked the songs themselves though, MUCH better than the triple minute monsters in #3, and I'm sure it could be a much better game if you listened carefully to the notes and tried to place them on the keys appropriately. A good way to adapt this to easy mode if you're scared of making it too hard is to make a difficult verson first with each note to a key, and just spreading out the notes slightly, but keep the beggining and the end of a riff the same. Also, if there are two riffs that are exactly alike, don't make the second one differently.