Thank you!
I created the all the sprites in Adobe Illustrator, but they are very simple sprites reused throughout the game using Unity's 9-slice system and some custom made code to procedurally generate rounded rectangles for cards, buttons and windows, so nothing special.
By the way, let me say your game is very very good too, and I feel like itìs an even more impressive project for the 1 week period of the jam, it feels like a complete game, very well done, especially on the atmosphere!