A good looking game that gave me some COD Zombies vibes, it probably needed to start slower with more of a tutorial feel so you could find how everything worked. I think main down side is that i felt and was over powered fairly quickly - although I did better in following attempts.
My minions did get stuck as was mentioned and it didn't seem at times I could break them from their tasks (to help fight the zombies).
Great music and art and design in general and certainly met the theme.