Very nice, but...
I'm not sure if anyone has mentioned it, but... the whole "post-apocalyptic world in chaos!" genre has been overly used and frequently abused. So, unless this story has some sort of MAJOR twist (which you can't really tell from the trailer) i'm afraid it is gonna fall into the dark regions of high-budget, eye-popping, jaw-dropping, generic garbage...
But, on a lighter note, i still loved the trailer regardless. Lol, best flash animation i've seen so far. *Thumbs up*