i honestly wouldnt mind paying around 5$ for a more fleshed out version of this game. My tips would be to add an endless mode, expand on the amount and variety of cards(not easy but makes the gameplay loop more variable) and give players some sort of upgrade system
(not an in-run system because that would just complicate runs more, but i mean something like necrosmith has. it gives subtle boosts that make playing the game over and over feel worth it. plus it's not multiplayer so it wouldnt bother anyone with the whole "noob vs pro" stuff)