Nice choice with the Doom 1 music fits quite well i find, also this is fairly well done I enjoyed slaughtering zombies on the last level with my super-shotgun. 5/5
I gave up because there are some things that really need changed to make this enjoyable, #1 make them die when they touch you, #2 either slow them down or shrink them, #3 fix the freaking life thing i had 40k points but never got a new life.