hmmm, Maybe add a hard mode where the opponent locks one of your cards. Also I’m not sure if this was intentional, but when I played the same card as my opponent, (only for rock paper and scissors) if my card’s level was higher I would win, but if their card’s level was higher I would tie. I think if you wanted to make it a lot harder, you should make that scenario end in a lose, not a tie.
But yeah I did have a really fun time with your game.