I learned the hard way, in order to create a playable .exe for Mac, you need to do it on a Mac. If you export for Mac on a PC or Linux it won’t work.
Viewing post in Mac Test Build - ANCRA v0.85 comments
I've got a couple of people who have it working on mac - the issue seems to be saving. At the moment the workaround is apparently moving the game to the apps folder, but I have a plan to address this that I'll test in this weekend's update.
If I continue to get problems, I'll defo see if I can get hold of a mac to make a build from, maybe that will provide a better fix.
Thanks for the heads up!