Hey I got it to work on Mac, not sure if you have already. You basically put it together yourself. I used another renpy game as an example.
The folders are out of order so here is where they go:
1. Show Package Contents
2. Create an Autorun folder in the Resources folder
3. Put the Game folder, Renpy folder, MyTuitionAcademia.py, and MyTuitionAcademia.sh (all from the main folder you downloaded) in that Autorun folder
4. Take the Lib folder (currently in the Resources folder) and put it in MacOS folder. Do not use the Lib folder in the main folder (you just need python2.7)
It should play now, well it did for me.
I've seen this problem with other games for MAC, I might try it out for them too. Hope that helps.