Thanks for the report! It seems to be a problem with Godot 4 and macOS. I can upload a mac build after the voting period.
From https://docs.godotengine.org/en/4.3/tutorials/export/exporting_for_web.html:
"Godot 4's HTML5 exports currently cannot run on macOS and iOS due to upstream bugs with SharedArrayBuffer and WebGL 2.0."
We ended up not using SharedArrayBuffer since performance difference didn't seem large and it would have required a new pop up on itch.io. But it seems the WebGL build is still broken for macOS