If you download the RenPy SDK (just google it) Copy the SDK to you Applications folder, then copy the root "Myfamilyfarm-0.0.1-pc" folder to the SDK folder, it will appear in the RenPy Projects list and you can launch it on a Mac from there.
do you have like a video showing the process, a bit confusing
I don't have to test the game build, so this must be best solution for now.
