Pros:

very cute Mario Map, would be nice for younger players who scare easy, the jumping up to break the ? box was nice, you should add more of them.

Cons:

was a little hard to get threw because a lot of the gates are more like solid walls with no switches or leavers to open them. A lot of the doors are useless, trying them all just to see what opens and what doesn't. A hidden passage behind the painting it nice but honestly I didn't even have a clue that was a passage till a smoker grabbed me and dragged me inside it. Maybe a hint or something saying its there would be better, and less useless doors, when I saw the big door with a lock on it, I thought i needed a key to open it and advance to the next area, had to use no clip more then once to get to the place you had the ammo and then to the final castle in the map. 

Conclusion:

It's a nice idea for a campaign just a few tweaks on the first map, and lol, maybe not spawning into a room full off zombies while the computer bot run to the second safe room 50 feet away and leave me fighting the zombies by myself. Then after I closed the safe room door the campaign begins all over again. 
Since your asking for ideas on other maps for this campaign maybe more themes from older video games like this 1, like Zelda for instance