Ok, right. I think I have the web build working now: https://happy-frog-games.itch.io/yes-yes-skeletons-go-fight-the-m
The disclaimer not only warns you about the issues but requires you to do an intentionally-slightly-excessive sequence of key inputs to progress. It doesn't require any simultaneous key presses though. Should be fine? I think? Just going to post it here to make sure though all the same...