Great job with this game! Nothing about it felt confusing, unbalanced or out of place. I liked how you explained everything at the start with a menu screen, but it was even better how the enemies got progressively harder. This enabled me to quickly learn how the game worked with some of the easier enemies, so that I felt more prepared when facing the master of puppets. Different types of cards for different modes of difficulty could have been implemented, but I definitely think it's fine how it currently is. Nice work!