Wow this game is oozing with style and is basically a completely functional minimalistic music trainer/teacher, really awesome job. The intro is so so so slick, as well the effects whenever you start a new level. Asides from some blurry edges of images/text, feels like stuff out of a fully developed (and especially stylish) game. I also really like the title theme and how you got to break it down at the end (although I had to bow out at that point got a bit too difficult for me). I just watched a video about approach notes and it was cool to be able to try it out through something like this (and I think reinforced the info as well).
I wish it was easier to identify where bars/beats started and ended (maybe some vertical bars in addition to the shading or something), and also would be nice if the patterns were maybe just 1 bar instead of 2 (and I think 4 at the end) given there's no seeking functionality as I spent a lot of time waiting to get back to the part of a beat I hadn't figured out yet, but overall this an extremely cool and polished project, especially for only 4 days, well done!