It appears the Mac export is broken. :/ Not sure what's wrong, sorry. That said, I believe your Github page for it is still set to private - if you want to make it public, I could potentially help you get a viable Mac export, as it's all I have.
I don't think anything in the GitHub repository would have anything to do with it; I made the game in Godot, so it's probably something with the export process. All I've got on GitHub are the scripts I wrote, none of which have anything to do with export.
Okay, after a lot of hesitation, I decided to make it public. I don't know if it'll do any good, since the export settings aren't a part of it, but whatever.
