Keep running with this
The art and style of this game is amazing, atmospheric and unique. For a flash game, it looks just awesome. The mixture of the cartoony body structure with the ultra-naturalistic details works surprisingly well. Sort of like a surreal Ren and Stimpy kind of thing. The effects were also very impressive, and the choice of music sucked me right into the game.
The action is frantic, and really satisfying when you pull it off. i don't mind the camera zooming out to show approaching enemies, and when it zooms in, I can see all the slick detail put into the captain and the world around him. My biggest concern is that enemies often float outside or inside of the landscape, where your bullets can't reach, making some battles a test of patience, rather than accuracy and agility. Perhaps if the enemies moved a tad slower, or were a bit more aggressive, just to keep things kinetic.
Progress can also be slow, since you only have a limited amount of lives, and platforming while fighting is like pulling your own teeth with a rusty spoon.
I think you really made something amazing, that stands out form the usual fair on new grounds and I think you should keep running with these ideas. If not another tank men themed game, I believe the style in which you present your flashes is a refreshing treat for the eyes, and you could really make something great!