Such a unique game put together, and in a week no less? Incredible work! The art style and jazz compliments one another really well, which creates an incredibly charming atmosphere.
Along with what some others have said, for a week long jam the tutorial was alot more than I originally had as an impression going into it, but the overall gameplay loop itself is interesting! My biggest issue was likely around the roman numeral cards; I ended up finding a chart on google to have along side the game as I'm not used to reading them.
All in all, amazing work! I can't wait to see any updates you all do!