This was fun. I liked the character art and the different personalities/decks each character had. I was low-key hoping that one of the characters would be explicitly be trans or non-binary, though I did not feel it was needed.
Something that I think could be a fun thing to add could be gaining a random card from your date's deck if you win that round to use. It would give a little more variability when playing, with the feeling of your character learning new tricks from their past dates. I don't think you'd want to keep cards you earned once you returned to the selection screen, but I could see it being fun for the reminder of that playthrough. Adding completely new cards for each character after each win could also be fun, if you wanted to make more cards.
Something else that could be a fun add, though I acknowledge would be a lot more work, would be a little bit of dialog between characters during the date, based on the cards they play. I loved the flavor text when you moused over your cards, and could see it being fun to have more of it when your date plays his cards. It's definitely not needed, but it could be fun.
Overall, I think you have a really solid game here.