This is great! I'd love to see it as part of Simon Tatham's Portable Puzzle Collection [1]
Someone should add this game! Simon has very good developer documentation [1], and the code is very cleanly written C. Seriously, every C developer should take a look at it, it is inspiring [2].
[0]: https://www.chiark.greenend.org.uk/~sgtatham/puzzles/js/tent...
[1]: https://www.chiark.greenend.org.uk/~sgtatham/puzzles/devel/