Very nice collection. I like the dystopian vibe, reminds me a lot of Half Life 2. Some maps are truly impressive.
One question: the map "peculiar investigation" - is it supose to be just a simple walk, without monsters? I guess it is, but even so, it's weird that a huge portion of the map will be skipped (the one that requires the blue key to enter). Is it meant to be a secret?
I could not reach the blue key without cheating... Maybe the author of the map is reading this and might give a hint...