Alright. First of all i like the overall dark and agressive athmosphere this creates. I can vividly imagine goths in realy high plateau boots dancing their lovably weird walk-dance to this song. On a second thought, this kind of dance might have its root in courtly dances of the baroque period. The shoeware was equally limiting to movement. But i digress, sorry.
What i dislike is the over-use of arpeggiators which i consider lack of music theory knowlede or just plain lazyness. Also the arpeggiated synth is too bleepy (no better word to describe it right now) and detuned so it began to grate on my nerves towards the end. On the other hand, that might just be the effect you were aiming for, seeing that this is about zombie apocalyptic stuff! It also wakes associations to sackpipes and generally medieval music through the detuning, although i'm quite sure, that was NOT the effect you were aiming for :D
Now, on to the vocals and lyrics. I loved the way the vocals are processed. Unfortunately i don't have any experience in vocal producing as i keep my tunes mostly instrumental. What i can say though is that the distortion and delivery fit the topic of zombies really well. The lyrics complete the work of art and kinda reminded me of cannibal corpes minus some of the brutality.
Kudos (i know, no one says kudos anymore but whatever) for the distorted bass because i think it's not easy to musically use a bassdrum this heavily distorted but you pulled it off just well.
Good! 4 points :)