This is a fantastic idea, and I would love to see it expanded upon. Maybe differences in the game based on shooting down fewer enemies, maybe more levels.
I am very impressed by the visual polish put on this game, and it controls very smoothly as well. Sound needs more variety (lol, pig noises when hit) and the writing needs to be less openly admitting that there's no writing, but if this was made into a full length game and put up for sale, I would buy it in an instant.
It is perfectly okay to load something to see if you have made it successfully without uploading it to the internet, y'know. This is a good test of functionality, but there was really no need to upload it.
Seriously, this is still the third-highest rated game on the site? People, there is NO CONTENT. It is a joke at YOUR expense. It exists strictly to mock you, and you have missed the joke. Even when you upgrade everything, the core gameplay is still the same... which is to say, basically non-existent.
I'm not sure what you did, but somehow, when I end a level, the music I'm listening to on Pandora Radio stops playing until I pause and un-pause it. How the hell did you do that?
You have a good game engine here, but there's some memory leaking going on, as survival or the last couple story missions eventually slow to a near crawl once anything comes on screen. Also: Your sense of humor is the most juvenile I have ever seen. Get a writer or editor.