Great submission, really cool concept that goes with the boss theme. Couldn't get to the boss yet, but the puzzles are nice and I liked the branching ways.
If I can think of one point of improvement, could be that the music can be a bit repetitive in the long term (after dying a couple dozens of times lol), but nothing that can't be changed adding some other BGMs of the same style.
I hope you keep improving and playtesting the game,the concept is really nice and it stands for itself