I enjoyed this for the most part, although some things did try their best to sour it for me. The atmosphere and level design is great, but some of the required backtracking was handled a little clumsily. I see the hub thing that you were going for. It's a neat idea.
The rebuilt city was nifty, even if the sewers felt far to repetitive.
The ending part with the elevator shaft really stuck in my craw. I very nearly lost my temper to that spiral.
Overall though, this is one I'm glad I played.
A mixed bag of 5 levels. Levels 3 and 4 are particularly excellent, but the others tend to be mediocre. Most of the levels are designed in a very snakelike way, standing out from the stock style maps. However, the excessive bonuses tend to lower this set's rate.