okay so I was able to test it myself at work.
If you open terminal and do the following it will work
Cd downloads(assuming its in your downloads)
Cd mac(if you know how to do both these in go cool)
Chmod +x Game.app/Contents/MacOS/rpginabox
Then go to privacy and security settings and allow the game to run.
I wish it was easier and there probably is an easier way in the future but at least thats how I got it to work at work.