Waste of time..
It's always good to try, but in this case..It didn't work.
1) The animation was poorly done, (maybe even attempted)
2) The zombies looked as if they were taken from another website then cropped from their original picture frame. (Judged on the look of the human as the only thing that looks made by you)
3) Level 4 was clearly made to be impossible as the zombies sliding across the screen made it impossible to hit them.
4) The controls were fine, except from the shooting.
(Gun points forward, bullets fire up, wtf?)
5) No Background.
Could have improved it Much MUCH more than what it is now.
Take your time on a flash game, redesign it put EFFORT into it.
Only then will it become your very own Masterpiece. :D