Nice movement.
An enjoyable game with a nice selection of levels, but of course you could always add more. I liked the flow of the enemy, they moved quickly and I had no problems with it. Also, when the helicopter was blown, it made an interesting crash. I think you could have added a life bar as a different game type, one with the current and an extra for the life bar. Maybe in that game you could've had a wall to duck behind. Also, I think you could always have a bigger selection of weapons and more enemies. I think it would've been cool if the blast from the bazooka was a little more.. spectacular, it really wasn't much of an explosion. The shooting was fun, and I enjoyed this game, it doesn't get repetetive quickly, that's always a good thing. Maybe you should bring out a future version, for now, keep up the good work.