This was the response the developer gave me -
I'm not sure, I would need more details beyond the generic error they provided to narrow it down more. Not too familiar with MacOS, but I know that it can be overzealous when blocking things from running. They could try running this "chmod +x" command to give the app executable permissions as it may not have them by default, this article has an example: https://superuser.com/questions/1345755/how-to-fix-the-application-cant-be-opene... - they'd open a Terminal window where the game is located and run a command like this:
```chmod +x Game.app/Contents/MacOS/rpginabox```
Thinking more about it, though, they could also try installing and running it through the itch.io desktop app, as I believe it fixes the permissions automatically when it installs the game. There's a bit here about it: https://docs.itch.ovh/itch/v23.6.1/integrating/platforms/macos.html. Not sure if that's the issue, but probably worth trying that before messing with the command above.