Very nice art and overall effort! Well done team!
I recommend in the future that for jams that you grab the latest stable release. Godot 4.0-4.2 have some known issues with shader compilation when playing games in a browser on Mac OS. I believe this was due to a vendor library (ANGLE). I'm not sure what they did, but in Godot 4.4 it seems to be resolved.
I had some long loading times when switching scenes (even locking up the browser tab) which is probably due to the above issue and your older Godot version.