As others already stated, neither the browser version or the downloadable one work. Check https://docs.godotengine.org/en/3.5/tutorials/export/exporting_basics.html on how to export.
Viewing post in Georgio's Grand Getaway jam comments
This was done in 4.2, so I'm not sure if anything extra needs to be done, but I did enabled the SharedBufferArray support after that suggestion, but it seems things are still not functional.
Let me know if you have any other thoughts or ideas, I am curious why it's not working now, even if it can't be considered for the jam.