Nice job! I can see how this could be expanded in some really interesting ways so I hope you keep working on it. The 3x3 tile layout reminds me of the battle system from the Mega Man Battle Network games. No idea if that was an influence but it's cool to see that concept combined with Slay the Spire card based combat.
Create with Code 2: Become a Junior Programmer - Game Jam » Entries » Create with Code 2: Unnamed Card Game