Gotcha, I just checked the "SharedArrayBuffer" setting in the settings for the itch project, and that got it to go to a grey screen.
the main filename in the zip is the index.html file, but seems to still go to a gray screen.
I was able to get a version running on the desktop with the .pck file included afterwards, not sure why the desktop one is broken.
Really it was a rush to the finish, and didn't spend any time actually testing the game, hence why it doesn't work haha, but hopefully I can update it after the jam or maybe reach out