Why is there no macOS/linux version? I would love to play the game :(
Just download the source code from github and compile it.
In the folder run: cmake . && make (Don't forget the dot after cmake)
You might have to install libraries first, if it fails to compile (For Debian/Ubuntu it's libsfml-dev and libeigen3-dev)
In fact, he gives instructions on how to run in macOS:
https://github.com/HackerPoet/MarbleMarcher#macos