Hey, the demo works great for me on Mac but the full game won't even open/run at all. I'm on Mac Sierra Version 10.12.6
Hi, the version uploaded is the version Ren'Py says should work on all 3 systems. This version has been tested on Mac devices before release but as it is an older game, the Ren'Py version is also quite old. It might be a good idea to post what issues you're facing either here or on the Lemmasoft forums for assistance.
One thing I did that helped was right click on the renpy app, then say show contents or something like that. Then go into the folder that says Contents, then MacOS then double click on the black version of it. The terminal should pop open and you should be able to run the game. I've had this problem many times, and this way always works.