I thought this was nicely animated, but the whole zombie types thing is well-trodden ground.
The familiarity of it prevented me from enjoying the humour, so I think you would benefit from coming up with a more original concept.
I found the voice a little flat and found my mind drifting. I know this was probably a stylistic choice, but try a more dynamic vocal performance to hold the viewer's attention and sell the humour.
Overall, there's potential here, so I'll be keen to check out your other work.