Pros:

+ Looks much better then the original pistols
+ The animations are really well done

Cons:

N/A

Conclusion:

I really hope you plan on doing more custom weapons in the future, I don't think I'll ever use the original pistols again.

Pros:

+ Amazing mapping job
+ No bot navigation issues
+ The ghost events were really well done

Cons:

- Some of the textures were too cartoony

Conclusion:

Without saying anything specific as to avoid spoiling things for those who have not played it yet. I'll just say you nailed the 'haunted house' feel perfectly. Even the little things (like the changing lights and the small sounds you'll sometimes hear) were done expertly.

Pros:

+Great lay out with multiple paths
+Good voice work in Map 1
+Map 2's 'something isn't right' event was a great addition
+L4D1 Survivors
+No bot navigation issues

Cons:

-Finale is a bit cramped with too many ways to instantly die.

Conclusion:

I found the short length of the campaign to be more of a pro the a con, too many maps add large stretches of nothing to artificially lengthen them. Your campaign kept things interesting at all times.

My only complaint is the finale, I don't mind a bit of a challenge but getting insta-killed multiple times is just annoying. I'd recommend adding in a few fences at the ledge so it's not one big death trap.