Hey ! You made a great game :)
We don't have a lot of control on our hand. My idea : Instead of adding a tower "Ace High Card" we can "upgrade" another tower with one card from our hand.
Hello 👋 In case you're still interested in this type of game: I'm working on a new version of Poker Tower Defense and just uploaded a Demo here: https://belindamakesgames.itch.io/royalflushdefense You still don't have more control over your hand, but now you can merge towers together to get the next higher tier