A great defense game:)
It was good, but it wasn't really anything new. I only played normal difficulty but to spice things up for a future defense game at a higher difficulty level I think it would be awesome if you could incorporate a loss of gunman based on damage received (they are getting shot back at afterall). Or perhaps demand higher wages as the game progresses due to higher work load. I stopped playing at lvl20 because you can get enough gunman and silomen that you dont need to shoot to successfully defend it, and then just bought stuff when the day was over.
Once again, great game, keep it up.