I absolutely love the concept of this game - I’ve played several music-based block puzzles this jam, but yours is the first one that makes the player actually engage with the music itself. As a musician myself, it’s really to have actual musical gameplay in a jam game.
I had a lot of trouble with the gameplay itself, though. I often felt like I was guessing at the parts of the song I couldn’t hear - since all the songs changed drastically from measure to measure, I had no pattern to go off of, and no reason to expect a big drop on measure 2 when I only heard #4, for example. I’m sure the idea is that you’re able to piece that together with a combination of knowing what sections go in the given measure + block puzzling, but I’m not great at puzzles like this in general, and it felt like despite enjoying the music part of it, the blocks part was getting in the way. I kept thinking, I’ve solved the music already… but the game won’t let me move on because I’m rotating the blocks wrong or something. It doesn’t help that when you get something wrong on a measure you’ve never heard, the game just throws up a red X with no further info.
(Side note - I still don’t really know how the rotating blocks work. I thought maybe each quadrant stayed the same, and they would play along with whichever ones they were stacked atop, but at least one seemed to change beat completely on rotation. That didn’t help with the guesswork thing. I also did find it a bit tedious having to listen through the 10-second loops over and over to hear the part at the end I wanted - a scrub feature of some kind might be nice.)
In general, I adore the idea of a music-based puzzler like this. I think it could just be a little more player-friendly - although I’m sure some of my difficulties were just due to me being solid at music but terrible at block puzzles :D