Hmmm.... I'm not sure what to say. After reading all of the great comments I finally decided to download the game. The screenshots didn't do much for me, but that is since most of them are based on Model Pack 3 and I've been working on a game using Model Pack 3 as well, so it's way to familiar for me.
After playing I'm not really impressed, sorry to say so. Allow me to explain why.....
1. It has the same problem as DF!, everything is way to repetitive. After walking around for a while, you tend to get the feeling like you've been everywhere before.
2. Imo the level is way to large for the little action that's going on. While the largeness of the building is overhwelming at first, it becomes boring after a while since you seem to roaming around for ages in this building, without any real action going on.
3. Falling through the floor. That seems to be a problem, for no reason you suddenly fall through the floor and it's game over. It happened to me for example after I picked up the bat, I just dropped through the floor.
4. Speed. The game goes from 32fps to 13fps to 32 again. It's going up and down and really infuences the fun in play the level. Same as with DF1, were speed has a negative influence on the game.
My final conclusion is that even though the level largeness is overwhelming at first, that actually has a negative influence on the gameplay, action and speed in the end. The level has failed to captivate me, I really did expect much more after reading all of the comments.