More than the sum of its parts. Maybe that's unfair - the parts are good - but what I particularly liked here is how the narrative development gradually builds things up from a low-key romp through expansive, nicely modeled hospital hallways into a properly suspenseful conclusion. Gathering the eight signatures gets the player to explore thoroughly and familiarize themselves with the rooms they can access at first, and there's plenty of background detail without it feeling superfluous. None of the puzzles are illogical and at their best they require some of that enterprising teen-fiction-paperback creativity.
None of the NPCs get truly deep characterization, but they don't need it at all. They fit neatly enough into well-trodden narrative tropes that the player gets a good idea of who to trust, who might be useful, and who represents a puzzle. The execution of the climax is excellent. A familiarity with the layout of the hospital and a careful eye for detail pay serious dividends.
There's no real parser fiddliness except for the service elevator, which I think I just didn't understand completely.