Tech wise this is basically Antichamber. How did you pull that off in 36 hours?
I do notice some visual glitches so portals aren't actually seamless in the game world - however you still have a proper portal renderer in there. Unity comes with the feature now, or did you manage to build that in that little time?
Certainly looks impressive.
Actually: just checked the code - it seems like Unity has Camera objects that do the heavy part of the work. Still quite an achievement to get this in 36 hours. Well done!