What browser are you using? Looks like you might be missing web assembly, might just need to update your browser.
The game works on the latest Chrome and Microsoft Edge, haven't tested Safari yet
Now 2 new problems.
First: game tries to load from html.itch.zone domain, which is outdated.
Second (after manually changing domain):
The following features required to run Godot projects on the Web are missing:
Cross Origin Isolation - Check web server configuration (send correct headers)
SharedArrayBuffer - Check web server configuration (send correct headers)