An interesting idea, if nothing else. Robo-hobos.
There was one thing that really captured me with, though, and that is the attention to detail. For every backdrop, there is some cool or humorous graffiti (David Firth <3's Jerry Jackson comes to mind), and little other touches like the dumpster, empty can, and so forth.
Along with this, the robots themselves were rather complicated looking. It's clear you spent a lot of time on the details.
Sound was as fair as it could be (I know it's intended as such) and the music was a perfect tone at the end of the Flash. Well done.