We would be honored to see a video game using the Grit System! I think using some version of our scores, burning a resource called grit, and especially weaving in the numbers 3, 6, and 9 can all work well to make the game feel Gritty. I actually think a shared-by-the-party pool of GRT is brilliant and doesn't "break the rules."
Note: we extended the game jam by a week, so there is still time left! If you have other specific questions, please feel free to comment here or ping me on Discord at-Stillfleet.