In the summer of 2022, I wanted to fully dedicate my self to make a game after failing multiple times. I picked up SDL and started developing, and here I am!
While you could state having an editor to be the only indication of a game engine, the codebase of Moon is at a such high level, it's more or less an engine (or at least a framework).
If you can't find what you are looking for, you can make it! Add it to the repo if you wish!
Sorry, the current documentation (if you can call it that), is really simple. I might add Doxygen to it, though!