First off, music and art are very professional. Really cool concept, however I did feel as though the game design was a little unfinished. I think to improve it there needs to me more constraints, such as a limit on the number of cards used per level, or only being able to pick one card at a time. Gameplay would have been difficult to figure out without the useful instructions underneath the game.
I thought it was really cool and clever that enemy movement is inspired by chess pieces. I played the game to completion. A win screen would be cool, but I understand with time constraints why it probably isn't there.