I like the game aesthetics. It feels really polished and cohesive. You could move it to the next level by adding more transitions. I see you already have some animations. Did you use DOTween or built in Animator?
From the design perspective I would say the cards are not well balanced. In most cases they do not give real choice. You just need to do the math and use better combination. Also they miss the potential of cards - stats synergy you wanted to explore. I would really like to see cards like: "Gain +3 Max HP".
Another big con is that I cannot see the reward card. I had to choose blindly which made the experience much worse.
Also it would be nice to have some settings or at lest mute music button :)
I think with all of these improvements you may end up with a really decent game!