Huh. It's a Godot export, so I don't know how the Javascript portion works. My only guess would be that itch.io is serving the files wrong somehow, but that seems unlikely?
I don't know anything about the programming side- I just did the art for my game so I have no idea what it is. It's a shame, I'm into weird surreal games and this one looked good. Is there any way you could add a download and perhaps that would work?
Ah, I work in Godot, too. I've also had a lot of problems trying to upload webGL exports to itch.io I'm going to look into this further. Maybe I can find a common issue if I dig into the code. I can let you know if I find anything.