Okay, I didn't update for the last few days, but finished the game in time! Yay!
All cards are implemented, a few of them don't have any visual effects but that's fine. I added the buldings and trees as well, and the game looks much more cohesive now.
Please try it! I have Windows, Linux and Mac versions available:
https://itch.io/jam/my-first-game-jam-summer-2020/rate/711488