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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