It's a horror mod with rusty hospital chic. It's all about you tripping balls and fighting zombies, and though the latter could have used some work, the former certainly is brilliantly done. The atmosphere and sense of vulnerability are perfect, and it's very, very dark and loud.
Jump scares such as monster closets are very rare, but when they actually occur, they're pretty well-done, sort of like the skull-desk in Amnesia.
What little there is of the story is pretty cliché, but I think it's worth a play.
http://www.moddb.com/mods/mistake-1