Certainly needed some instructions on game rules! I think I understood the vibe with like a Hearthstone-style battle system (attacks units and if no units attacks player). But I couldn't understand how the different suits equated to attack/defense. Seemed like a Jack attacking a six should just destroy it but it would seem to do a random amount of damage to it. Communicating those rules to the players is needed here.
But certainly a cool concept! I feel like this could be the next Balatro, if you go a deck-building approach with adding "powered up" cards to your deck and stuff like that. and nice usage of your SDK! Cheers