Quote: "The SWAT team has busted in, and your team escaped, accidentally forgetting you."
wouldn't it be better if, they didn't forget you, as that sounds pretty lame for a swat team, they sent you down to the basement to check for an exit route, when you get cut off, so you then have to use exit you found to make it safety?
Quote: "hidden tunnel system that leads to the building"
sounds a bit too planned and too much of a coincidence to me, maybe something a bit less......i don't know how to put it.....coincidental (using coincidence twice in one sentence! ahh my vocabulary sucks today).
And also, didn't you say you weren't going to change the story line?
looks a bit ordinary in the screenies, and your level design gives me the impression that you want to give the player alot of space to move around in, thats great except it doesn't look that realistic, nor does it look that good if im honest, try using smaller rooms (maybe not for the warehouse but definitely for the office.) and then you can use fewer entities to take up the space. Also i think you need to place your entities a bit further apart to fill up the rooms more.
Well that my two cents, enjoy!?!?!
HMMMMMMM