are you on a mac system by any chance? sadly, godot 4's web exports are known to have issues with macs.
and if that is your situation, this reddit comment seems to recommend trying waiting a few minutes and that it would eventually load, but i sadly have no way of testing that. we'll try and export a macOS build, which should be added here shortly!
update: the macOS build is up and running. as we don't run macOS ourselves, it would be really appreciated if you (or anyone) testing it could let us know if it works!
and thanks for trying our game, either way!