Yeah, the ideia was introducing more enemies as the game goes, but i didn't have enough time (started working on it by friday).
But your cads actually do something! The shield is bugged, it actually does nothing but the rest does! It just isn't so much straightforward. If you pay attention, every time you use a card that buffs your damage (ice gem, fire gem and strength potion), the slimes die faster! I tried adding a bit of feedback when you attack with tose effects but it didn't turn out that good so i removed it. Thanks for the feedback though! Maybe i'll work on it after the jam, i really liked the idea and see some potential in it.