Hi, sorry it doesn't work on your pc, I didn't put the specs requirements because for cpu it should quite low like somethin with 2 cores, 2 GHz and anything with 4 cores and 3 GHz should work fine. For memory, 4 GB should be enough. Same for GPU 4 GB as long as opengl 3.3 runs on it so yours is far enough.
But I'm wondering are you on the last update (0.14.4.2) ? It enables low processor mode by default : 
Else yes, I think itch.io should be able to refund you as the program doesn't work (https://itch.io/support) not sure as you get it long time ago :/
Man, that's so so strange. Thanks for your help; I did fiddle with the low processor mode but it didn't change anything. Just super odd. I have 4 cores, 32 GB of ram, and GPU ofc should be okay.
I'll try a few more times, thank you so much for the quick response. I figured it should work which is why there was no need for requirements. Sigh. I'll keep trying but yeah, eventual and possible refund, I'm really curious if anyone else is dealing with this on mac OS