You nailed the "Portal" vibe very well with the aesthetics and overall feel. Also, Nick's voice narration was absolutely hilarious :D
It's an incredible amount of rooms/puzzles you managed to do in such short amount of time, which means you don't have to sleep at all or have 30h days, either of which is cheating ;)
The one bit of criticism I have is audio mixing: in my opinion music is way too quite while some sounds (like getting new power) way too loud.
Cheers!