Can I just tell MCheese that 'first-commenters' are not welcomed gladly - Unless they say something worthwhile. 'cool game' is not descriptive. Porfawesome however..! Let this be a lesson to all of you. First!!'s...
It'd be good with a 'survival mode' in which the buildings get destroyed. Then the ground, revealing underground bunkers (after a while of just dodging then into the bunker?