Making the portal system in just three days was insanely tough. I ran into so many bugs and challenges that almost broke me. Most of my time went into just getting the portals to work properly; I barely got any sleep during the jam. At one point, I honestly regretted choosing this idea because it was way more complex than I expected. But somehow, after nonstop work and alot of frustration, I finally managed to make it work and build a few levels. Thats why I couldn't spend much time on polishing ; this mechanic literally cooked me.
I can feel your pain buddy. I had faced something similar in previous WTF game jam when everything was going with my computer got crashed and the entire game completion was done by my teammate who was just a designer and he woke up whole night finishing the game by just following tutorials . "There's always a jam that does not gives us Award but gives us a really good lesson". Making portal mechanics is a big achievement even i don't know how to make it. It's some advance stuff. Keep it Up !