Just.....not good.
I wouldn't call this game "good" or even "meh". The 3 is for decent rag doll physics, detailed blood art, and that when you shoot things, they fall down. The rest was a result of poor design choices, and the awful music. Don't get me wrong, I like my heavy stuff, but that was just....noise. Too many jumping zombies for so little ammo, as for the ammo upgrades, you take the time to hit them, you're losing some life. Zombies took way too much damage, jumpers went way too fast, and if you don't get those ammo upgrades, you're done when the jumpers really get going. Try too buff this game up, movement, 12 shots to begin with, maybe 8, and you'll probably have a pretty good game here. Better luck next time.