"Why am I here? Is this all there is? What's behind that door?" Fundamental questions that humans need to be answered.
The story may begin with a many-times-used setting, but it quickly takes a sharp turn into the unexpected.
Many years ago, I read "The Gates Of Creation," by Philip José Farmer. "Unfettered" repeatedly flashed the feel of Farmer's story, yet definitely retains its originality.
The author manages to develop the characters in a short span as well, including some of their less than desirable traits - that make us all human. Yes, most will know the names before they are openly offered - that does not detract from the story, which is short, and does not wander off course with pages of fluff, which I despise. (points for that)
Now, to one of those 'human' questions: Is that all there is? Next installment?