Really enjoyed the game! The battling system was easy to pick up and the art was really well done! I am not good at auto battlers and only failed once (before I got the weakness system down). Some music would have been nice and some new mechanics I haven't seen in other auto battlers would be cool as well, but the game that you have produced is very impressive for 48 hours!
One thing to note: it is hard to tell what you need to build when you are facing an enemy with 0 health because their portrait (including the colors of their pieces) is grayed out.