Fun and dripping with style. I liked how you introduced new gameplay elements as the levels progressed to keep interest up on what, might have been, a kind of "casual, watch the action play out" kind of game. I made it to Tulsa and died twice... will prob come back later to try for Seattle :-)
My only criticism is that the explosion sprite looked a little phoned in, but that is a very MINOR criticism!
Edit: I'm referring to the explosion when you hit one of the drones in the factory. Looks like it might have been carried over from the small-size on the battle field, but looks blocky/unfinished when enlarged?