Hello everyone! I have some good news
I fixed the web version of this game, there should no longer be a massive lag spike in the first level and the boss music should play as intended.
I also fixed some oddities with the web version, like having a full screen button that didn’t do anything or having a quit button when you can just leave the page.
Unfortunately I won’t be able add the updated web version to the game until the jam ends, as I almost got myself disqualified by updating the game during the jam.