I might have to make a build for that version of Mac, will update you in a day or so.
Uploaded new build. I'm not all that familiar with building on macs, but I was able to get a hold of one with big sur and tried it. So at least I was able to confirm that it works on at least one. If you aren't aware of security settings when opening the app, try looking at the post with a mini-tutorial: https://itch.io/t/656311/i-cant-open-the-game-on-mac-os-catalina-maybe-because-i...
I usually have to do that when I download a game from itch for a mac (probably don't need to command line it, can just extract zip, and double click). Good luck!