Great game! It really encouraged me to just run around and explore what you built. I had a blast! :)
A minor suggestion: when going through a portal, it would be awesome if you could give the character an impulse (ideally maintaining their previous momentum). Even though it's a small detail, I think it would add a ton of 'juice' to the game.
Also, it felt a bit weird that the characters stand there in what looks like a modeling A-pose while idle, but that’s just my personal opinion and honestly doesn't matter for a short GameJam project. Maybe you can update the idle animation later if you continue working on it. Great job!