I thought this was a decent game. What I did not like about it was how repetitive it was. That didn't stop it from being fairly fun. I think its biggest strengths are probably how you get the hang of it after awhile. You don't have to worry about new kinds of enemies coming. I felt it was best to wait for the walking people to come before killing them.
They don't have weapons, so you need to get the bigger picture of the tanks. I don't even know if the helicopters fire weapons. Not sure if it was meant to be a joke how some were different colors (the citizens). The designs were pretty good. It reminded me of Dan Paladin.