While a zombie fic almost writes itself as a Last Stand fic, there is the matter of it seeming like a tell someone story than a show someone what happened. The dreadful show, not tell issue that pops up now and then.
This sort of fits the theme, but it is a bit weak and could have used some fleshing out to properly fit the theme of a Last Stand. Which kind of needs there to be a stand, and it's quite final. Last is last, after all, ne? And survival or even winning makes it not the 'last' one.
Spelling and such loks fine, the details are there, the story does flow... but as noted, there are some issues as above. Much like a pizza, it is hard to get a zombie fic wrong... but sometimes, the toppings don't quite work together well, y'know?
This is my judgment and I stand by it.