Absolutely fantastic! I love the surreal sounds and graphics, to give a sort of soothing feeling to killing humans haha. The bright/lurid colours were an excellent choice. Oddly, I found the lack of sound effects to be a plus because it added to the sense of detachment you feel as the player.
If there were different kinds of abilities I could see this becoming a very intense strategic shooter.
I'd love to see this made into a full game honestly. I'd buy it.