This is sick! Would you possibly be interested in having native Linux files, instead of just Windows?
It doesn't affect me too much, but it would be nice to have, though!
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Yes I did intend to have a Linux build when I released the Windows build (initially the game was web only), but when I tried exporting it, it had issues (specifically, map metadata wasn't being read), so it's just Windows for now. I'd like to get it working at some point, but it is still playable on Linux with Proton/Wine at least, so not a big priority right now
So if the notes are spawning inside the box, that is because it's not performing well, since there's a desync between the map and the music itself. There's always going to be a little desync between them, which the game accounts for by shifting the spawn position of the notes, so the notes will still hit the target at the correct time. Unfortunately if there's too much desync between them, they'll be shifted inside the box, like you're seeing. If you just turned off that lag mitigation system entirely, the notes wouldn't be in time with the music, which would also make it unplayable. I'd like to go figure out how to prevent this, but that would be a lot of work, probably rewriting the whole map spawning system, so I'm focusing on Ch4 maps first