Fun game! I really enjoyed the visuals and the strategy element of it. I liked a lot of the smaller details on the cards, like how my cards are like level 77 and the kids are level 12.
If you wanted to improve, I suggest adding a 'restart battle ' option. I put down two of my units, the kid killed them and got to my side. I thought I'd loose but the game just stopped. Some music and sounds would be nice too.
Overall, fun card game. I'd love to see this sort of level as a one off in a full game with this battle system.