Absolutely fantastic animating there! I know it has black bars at the side, because the resolution, but next to the black bars are grey bars, what are them? Why they are there?

This is seriously not getting the attention it deserves.
Other than the odd aspect-ratio, it's good, and if it didn't have that issue....

Anyway, on to the review.

I went into this is pretty low exceptions, but those first few shots left any expectations in the dust.
While there are occasionally little flaws in the animation, it's very smooth, and very well done.

The story is a bit lacking, and it's really nothing more than a "Hack-n-slash zombies" film, but the execution makes up for most of the plot holes. (Like, why did they need to run out and kill all the zombies?)
BUT, you really want to build up the plot next time. Great animation can hold up a video or two, but it's a great story combined with the execution that really makes brickfilms stand out.

Oh, and 2:51 is by far the saddest part of the film.

The audio was good, but I felt that the voice actors left a bit to be desired.
The lighting seemed pretty "Off" in the outside shots, which was disappointing after seeing the inside shots done well.
And I'm not one for a lot of gore, but it's somewhat understandable seeing at it's a zombie film.

Anyway, I wish this would get a bit more attention. It deserves a lot more than it's getting.

And one last thing, the title doesn't match. It misleads viewers into thinking it's a slightly educational look at how zombies are/were portrayed in popular media over the years, just in brick form.
I suggest looking for a better, more accurate title.