Yea it's a bit unfortunate. The only solution will be for me to get another Mac to publish the game from.
Viewing post in Edypos (Deception Edition) comments
ShinDirafeh, if you follow the steps you can release a mac version that should work. Below is how people on macs can resolve the issues you ran into:
Some of this issue can be resolved by going into the Mac's Settings->Security & Privacy->Under the General tab->select App Store and Developers
This only resolves part of the problem. The rest can be done by opening a terminal window and typing the following:
chmod +x "/Applications/nameofapp.app/Contents/MacOS/nameofapp", adding sudo at the start if needed.
To universally open it up do:
sudo spctl --master-disable
Yes, those actions are required by mac owners to open the permissions for any applications that are not part of Apple's Developer list. The very last sudo statement permanently opens those permissions. The chmod is required sometimes if the port from a pc origin doesn't apply the proper execution flag on the app itself (which sometimes doesn't happen).