Tip: Get the download version of the game, this will not enable all features I believe, but you do get a lot. You get the Jade and Brass letters and the minigames. Don't know if you get the last 2 acts too yet, but maybe you do.
LOL at the end of the song when the bar is moving to the right, I looked away from the bar and my mind actually tricked me into believing that the screen was moving left.
I find myself being really sloppy if I got back to normal songs after boss battles, because in boss battles the extra hits are not counted as wrong. I recommend to not continually switch between the two modes. (5/5)
It boggles my mind that the people seem to find it a very nice perspective to be taken over by a blob of green substance and to scatter upon release, since they are cheering for your arrival.
Great game, it becomes quite easy when you get to the point were you understand the game (like all puzzle games). Your mind develops strategies to solve the puzzles, I tried the harder level set till I got to about level 12, then I quit because the levels didn't seem to get any harder. I really like some levels though, especially level 40, that one certainly took some time to finish. Good job overall, 5/5.