Story - Promising premise (I like the general story and the idea of z-pen and bracelet) but it is unfortunate that they had to cramp multiple genre into one show. I'm not saying it should not be done but it is risky to do so and apparently, they ended up with half-baked everything. The romance/drama, kinda destroyed the momentum midway, honestly. I found myself fast-forwarding starting from midway 'til the end.
Editing - Passable. As an avid viewer of zombies, I can say is barely average. In the introductory scenes for instance, They could have started with the flashback instead of present > flashback > present. It would have had made a great impact if they started with the flashback and transitioned to a hardened FL after experiencing losing her SO to the zombies.
Acting - I'm sorry fans but it's not great. The FL, in particular, is not convincing as a "hardened person" after the circumstances she went through. I can think of multiple instance but case on point: Lackluster reaction upon seeing who she thought was long-dead to be alive and well. Action scene ain't that good as well.

I can't think of so many issues but they can be overlooked (believe me, I overlooked a lot because I miss my zombie shows and I wanted to enjoy this) like how stupid it is for the half-bie male lead to be wearing the same clothes after many years?