The timing was hard to get right on the web; even on the native versions, it can be a little off. The first problem is the way audio is handled with Godot, and just in general, makes it hard to sync, and there's always a slight delay or offset that seems to change every run. Couldn't find a fix for that. Another problem is that it's hard to sync, it makes it hard to map the song correctly. I've since found about 3 notes that are just in the wrong spot, there might be more. Also glad you enjoyed the visuals, I put quite a bit of effort into them when I realized getting perfect sync might be a lost cause xD