Currently I'm not having the time to work actively on the engine, but what I plan to do is to eventually add comments describing how every class works. Even then, there are some things I still need to do in order for it to be usable by others, such as releasing tools for generating fonts and other data based on my file formats (RZFT and RZDB). In its current state, it's not at all intuitive, and a quick tutorial wouldn't be enough.