It took me a while to figure out what's going on, but it's a nice concept. It could do with some sound effects. I don't get why the player has to choose the chest and the door though. That makes sense in a physical card game, but in a video game I think the game should be making that decision instead.
Maybe do a tutorial battle to make the mechanics clear to the player. I like the idea of having an attack queue. I think this could be really fun if developed more. There's a kinda similar game from a different game jam that I think you could take inspiration from: https://kultisti.itch.io/onward-blocks
Overall, good job!