The Mac download doesn't work. At least on Catalina, it gives an error saying "The application "Plunge" can't be opened." (This is different from the message given for trying to run 32-bit apps, the leading cause of games not working on macOS.)
I'm seeing the same behavior, also on Catalina
If you use the itch.io launcher it works. Just for some reason doesn't work with the direct download.
Thanks, I'll try that.
