I departed pretty far from the core CC rules for my game for this jam - the d4 result table only shows up on one out of the twelve possible actions, and the way the rolls are defined are tweaked. I was worrying for a while whether I should even call it a Caltrop Core game, but Lex has explicitly stated elsewhere that if we feel it's a CC game because of its original inspiration, then we can call it a CC game.
https://whyhieratic.itch.io/pearl-provenance
(Edited to add: My previous game, Her Odyssey, followed the core CC rules fairly faithfully but entwined them with another system involving card draws. https://whyhieratic.itch.io/her-odyssey )