I enjoyed this a lot! I like the character art and music. The card system was interesting although it would have been helpful to automatically trash cards for points at the end of the round. I would also consolidate the buttons because having three different buttons for confirming actions was confusing. Looking forward to seeing more!
The game started with Space to go through dialogue, switched to Enter to select cards, then Q to attack. All of that can be on the Spacebar or Enter. "End Turn" could also be a selectable button to remove the need for more buttons. For a turn based menu like this you really just want menu navigation, confirm, and cancel to be the only keys the user needs to press.