It's a nice twist on Portal, but the physics are a bit wonky. I'm not sure how I was supposed to finish the last puzzle, so I just cheesed it.
It was the first time i'd use 3D physics with Godot I'll try to do better next time ^^
But now i'm curious how did you cheesed it ?
I put a black and white hole on the same spot on the other side of the room, grabbed the cube, and jumped into them, getting flung out the other side.