The mac build is kinda jank because I don't have a Mac, so I wasn't able to test it beyond phoning up one of my friends and asking him if the game opened. I remember seeing a similar bug when I tried to make builds of Unity games with videos in them for Linux--the video players just wouldn't work and I couldn't find any way to fix it. It seems like it's some underlying problem with Unity itself. That's why this game doesn't have a Linux version >:(
My best guess is that the Mac version of the game isn't playing nice with whatever version of Mac OS you have, and there isn't really a quick fix for that (which MAJORLY sucks, I've been struggling with this issue forever)
You might be able to use something like Wine (https://www.winehq.org/) to play the Windows version on a Mac. I can't guarantee that it'll be perfect, but back when I had a Mac I would use Wine to play Windows games and it worked pretty well!
Thanks for checking out FEEDING_LOG!