Thanks, glad you like it! Yeah I think scoring 100 should *technically* be possible, but it would be very rare rng basically, since you'd need to have the correct frametimes for the note to line up perfectly on the correct Y value. It's just specifically intentional, just a side effect of how scoring it done, but yeah I might do a bit of a scoring overhaul at some point.
Oh and thanks for telling me about the Queen Battle Original problem, turns out I just accidently placed 2 notes in the same space there, so you'd hit one of them but not the other. I've fixed it now, and it'll be in the next patch. I'm not just pushing that as a tiny patch now because the way it works right now, any changes to the map will mean the high score is reset to 0 (which is often good for big changes, but for tiny fixes like this I'd much rather it didn't wipe the score). So I'm working on a way to carry over specific scores if I want it to, for small changes like this. That'll hopefully be done and out either later today or tomorrow.
Edit: Fixed the Queen Battle Original bug now!