Risus is a light-weight system. The entire rule set fits within 6 pages in the PDF (complete with a couple of high quality stick figures). However, it is amazing how well the subtitle of the “Anything RPG” actually fits without tweaks.
Sure, it is tempting to want to add more to the system. I have been guilty of that (especially with Ars Incantâtio). However, once you get your head around the three types of conflicts, and understand how they can be applied to pretty much any situation, it becomes easier to see just how complete Risus can be as is.
I personally love how liberating it is to have a system that can easily be applied to any setting, any genre, anything at all.