U have much 2 do

i gave a 6/10 cuz of the graphics, and cuz i read that U didn't have much time.
so here are my tips:
1.add a story 2 it.
2.selection of guns could be good.
3.add a mute button
4.it is a little bit irritating, that i can't shoot down, so that would be nice 2
5.(this one U already explained at ur comments) make it longer.
6.add difficulty levels
7.survival mode is a must heve, with zombies!

and that's it, hope U can do something with it ;)

Needs more work like you said.

Obviously there needs to be more levels and more enemies, but also tone down how many hit points the zombies have. Also why do the zombies have swords, they should just have claws. People rather fight huge swarms of zombies, not 2 at a time. Maybe the machine could reload once in a while. Also there should be a reason for the duck key, maybe crawling zombies. Also I don't know what a shime is but these monsters look like zombies to me.
On the plus side the overall look of the game is awesome, definitely a 10. You should update this game with more when you have time because it could be a lot of fun.

really wish you could continue on it..

It's really too bad you don't have more time to work on it, because it COULD be GREAT the art is fantastic, and the charactor moves easly around, but the zombies take so long to kill, it gets a little frustrating... would love to see thia game with some more pollish on it...

Ummm not bad :3

but i have a question why th title is grunge :3?

bad

it was hard in a irritating way and it looked a little bit like metal slug, only crappier
i didn't like it