This comment genuinely made my day! Thank you for trying Final Fortune out, and I'm glad you enjoyed the concept.
As far as fleshing it out goes; my current project Bellum Arcana is my attempt to better flesh out and refine the combat system of FF.
I am currently looking to explore the concepts in the rest of FF re: collaborative storytelling through Tarot, but most of it will likely be through the lens of Bellum Arcana.
All that said, if there's something in particular you'd like to see me focus on fleshing out, I would love to hear your input!