definitely a unique concept for a game. took me a long time to figure out what to do exactly but I figured it out. the art is well done. the sounds really add to the atmosphere of the game. UI is cool and doesnt take up much space of the game and still easy to read. Also felt like zombies weren't really the enemies. IT WAS MATH :D
One thing I encountered that I would like to point out was when I died the zombies feeding on you sound kept playing even after restarting.