Pros:

We cant be lost,; its a good thing :)
Introduction, relatively interesting.
The "electric" thing, original.

Cons:

The last event is too much long
Too many bomb (?)
A lack of ammo
A lack of choice of weapon, ok, you can choose at the shop, but there is nothing next !
A little boring, not a lot of zombie.
Not very original place, a city...again, not very special.

Conclusion:

Its not a bad campaign, but It can be better, and the last safe room is on an interseting place( maybe you can change the place with a potential third map) But its too much...boarf. Its not really THAT funny, i hoped it was more orginial than a city, but its not bad, continue, I hope there will be another map(s).