Most of the development time was offline (on a train), so this basically ruled out anything to do with networking. There are probably heaps of ways to monetize

Most of the development time was offline (on a train), so this basically ruled out anything to do with networking. There are probably heaps of ways to monetize it (from what I can tell, the "buy a game upfront" model is mostly dead and everything is now free to play. But the reason I'm mentioning it here is because "I don't care if this succeeds". It was written in C (using SDL2 as the library for getting things on screen). I did have a version in swift, but being able to do most of the development in linux made made things much better for my workflows.