Fun, Yet Redundeant
I liked playing this. Controls were simple, graphics were nice. Sound was good. It does get old after a while though. I wasn't sure if there was a ending, or it was just a continuis loop.
A couple of things I think you should consider adding. One, powerups. I think it would make the game a lot more fun. two, shorter levels. That level just seemed to go on, and on. Three, more variety of enemies. It started to get kinda boring with the same old enemies again, and again. Finally four, more entertainment. Here's an example. When you blow up the starbucks, have people running out, on fire. Or, more animations for when things get destroyed. ie: helicopters, tanks.
I understand that this may just be a demo or not the full version, but please consider this if you decide to make another version. Nice work.