Loved this, the art is perfect to keep things simple, and the gameplay is fun, it's a great take on the theme. The only thing I struggled with initially was i didn't know where to place the zombies, but i soon figured it out. Also, you could maybe add more interactivity during the game. i found myself just playing them down and watching (not saying thats not fun) but you could do something similar to Clash of Clans with spawning in potions to aid your forces.