No specific theme this time, apart from the requirement that game must be written in a Lisp.
OK, thanks.
I don't know any Lisps very well but I may have to change that :)
If you stumble upon a confusing problem, we might be able to help you in #lispgames channel on LiberaChat IRC[0] or #lisp-gamedev channel on Lisp Discord[1]. Also, feel free to start a discussion on a jam page[2].