The browser console errors aren't part of the game, but being reported by the godot wasm export, they're not fatal and while they'd make debugging difficult, the fact this *is* a wasm export means debugging is a bit of a lost cause to begin with!
That may be true, but things like a blocking main thread can also be solved in a Godot export. Not all the errors messages are likely bugs though, I agree. However, the unreadable font is something that is fatal.
Sorry for that. I had to export the project in a hurry and didn't had the time to properly get everything sorted out. Unfortunately for the game jam I am out for the next two weeks and can't repair it. I will try to fix it afterwards.