I don't really play that many Flash games anymore, but I've been playing this all afternoon and the only reason I'm stopping is to do homework!
First thing I have to say is that the visuals could be improved a fair amount. The town looks really nice, but it would definitely help improve the game to vary the fight scenes and make them look better. That being said, I like the art of the buildings and stuff.
A second suggestion would be to identify a difference between Safe-ish and "Clear".
Another suggestion is to vary the reports scouts bring back.
My last suggestion is to have different icons for male and female survivors, because it's a bit unsettling to see a manly character icon named Mary.
All that being said, this was one of the most fun computer games I've played in years and I would be truly disappointed if a sequel is not in the future.