Pros:

- Good detail
- Nice layout 
- Different paths to follow
- Slightly confusing 

Cons:

Your walls are too thick, try using 16 or 8 units instead of  32. It looks more realistic. Double check overlapping textures and clipping brushes.

Conclusion:

I see good map making skills in this campaign with a solid effort for layout and detail. I enjoyed playing this map very much.