The core concept of combining the countdown theme with Poker is brilliant. As a fan of Balatro, I knew I was going to enjoy playing it.
You added an impressive amount of features and power ups in the short amount of time given to us. The only issue is that I think it might be too much for a game jam. I think the amount of content in the game and how the tutorial was done could potentially scare off a lot of players who might not be as familiar with the genre. A more streamlined version would have helped more people get into it as well as giving you more time to focus on the little details and balancing. It would also mean you get to showcase the best of everything, since players are more likely to encounter the best stuff if there is less.
I had a lot of fun playing it, and it got me thinking about how I would have implemented the countdown theme with Balatro.
You did a great job, well done!