I think that in a future update you should add the Emporers newest in technology, Prototype Laser-Guns. They use energy, cannot be deflected, but only take 1 square (cube, pixel, whatever) so you have to get them in the head. There should be a robot that uses this weapon, but the player should be able to acquire it in an upgrade.
ALSO, I think you should make a shield that drains energy as you are using it, and makes your attack slower, considering you only can use one hand. (Just a thing that would make it even cooler, maybe make it have the garbage door effect? Where it makes you be blasted back when you touch it, and for the robots by touch I really mean hit with a sword)