"Oh boy, can't wait for my daily commute to the liminal factory!"
Seriously though, the execution of the time and resources you had was excellent. This is a great example of "the brilliance lies in it's simplicity" and I really dig the mood.
The cherry on top would've been if it was made in source with valve assets :D
btw if found that if initially you don't wanna go the stairs route and go back, the corridor disappears and you can freely jump onto the void. Which in this game feels like a bonus ending!