Great game that reminds me a lot of the old Age of War flash game back in the day, love it! One of the other comments mentioned not knowing the recipes, so I'd like to add to that by saying an in-game recipe book would be great to have. Even if you don't want to straight up tell people what each combination does, you can have it unlock recipes as the player discovers them, or give hints like "fire + earth + fire = ???". One pretty major thing I noticed while playing is that after retrying the last level a few times, I noticed that my card hand was shrinking, and eventually I went from having 3 cards in my hand at once all the way down to just 1. It might have decreased the number of cards in my deck too, since in the end I only saw earth cards (which actually helped me beat the last lvl since I could spam tier 3 earth golems xD). I don't know if that's intended as a punishment for retrying, but I thought I'd report it anyways. Keep up the great work!