Oh my good, this is such a cool idea! And the execution is great too!
The concept of giving up your ability to deal damage effectively and having to move instead in order to herd drones in the direction you want is absolutely brilliant, and immediately made me fall in love with your game. It is true that, as others say, herding the drones is a bit difficult as it is, but the addition of some sort of companion (ex. a dog) to help you direct them where you want could fix that: and what if you had to move this companion with the mouse? ;)
I also love the artstyle and animations, and the absence of music is really a bummer, as it is the fact that the game ends at wave 11: give me some more, I need it! ^-^