With my shotgun, the game wasn't would I survive, but how fast can I click to fire an awesome barrage of bullets. The full machine gun isn't that great though. They can get past you on the 50's with a machine gun.
What I like doing is fully upgrading my shotgun and contiuously clicking. The only time one got by me then was one time when I had to pause. I still haven't beaten it. How many levels are there?
Of all the things, why do they need your phone number and all that, just so a month later they can kick you off! I think GameMaker at Yoyogames.com is MUCH better than flash, AND its free!
I don't like it because when I got to the second level I didn't see a door and then when I hit the water looking door it froze for a long time then went to the next level and won. Also you slide of the steps on the slug monster thing part. 2/5.
Note: I copied this, but people need to know how to do this on Handling if they can't beat it, and this is easy.
http://FantasticContraption.com/?designId=2913053