This looks GREAT; I really like how huge you can make this sort of pixel works, these are great to observe for a while.
If I get to 'nitpick' a little, it makes me wonder if those radical floating-angry-face pyramids are actually floating in mid-air or right on top of the buildings (other than the smaller ones shooting a beam). A bit of shading below could help there, but those are easily workable details.
I really like the Mega-P-BOT hologram, it gives a really cool sense of volume with its inner shading.