It's okay, but I think it could be better...
In a world like ours, where zombies are literally taking over every medium and art form, this is not original, but that's not the problem. The art and animation is great and I can see you put a lot of time and effort into it and it paid off.
But there is something I would like to stress and not out of hate but out of love for young animators trying to get their shows... and this is what I have to say:
"Voice actors, DON'T DELIVER ONE LINERS LIKE THEY'RE ONE LINERS" I'm not saying this to sound snobby, but really, delivery is everything in your jokes. If the voice actors can't deliver it it ruins a perfectly good moment. It is SO easy to make a laugh turn into a cringe. Trust me I know. I've failed to deliver many lines and at the time, maybe they seemed like they worked for whatever meaning and backstory those lines were, but months later if i watched it again and had a more fresh perspective i realized how flat and dull i had done.
again i intend no hate, but i do see this happening in this cartoon. The characters deliver their lines like they have already heard the joke before and are merely reminding people what the joke is. that tone has a detachment that hurts the humor.
Alright i'll shut up now, but I just wanted to throw that out there for you. Because I see this happening a lot. Humor doesn't just come from what is said, in fact most importantly it's how it's said.