itch.io

Sorry for ignoring, but i can't really help you. Firstly, i don't know how MacOS works. Secondly, i don't know how to change resolution manually. 

I suggest you to connect a really big monitor to your PC and try to change resolution of the game and switch your monitor back.
Another suggest: you can search in internet, how to change resolution of screen much bigger than your monitor (bigger resolution will fit to monitor by scaling). But the video card may not support this screen resolution, so, be careful with this way.

I hope, that i helped you, even if a little.

Try deleting the game and reinstaling it. If it keeps crashing try finding the game location and delete it manualy. I think you can do this by going into the folder in which the game is.