YT link: https://youtu.be/4BSGBUvS8uw
Though it may seem laggy when you play it in the editor, it really is buttery smooth after compiling it... on my Mac that is, I'm not so sure about other platforms cause the code is GPU related.
I couldn't use OBS in recording this cause I'm running on a ripe potato. It couldn't handle the overhead so I recorded it from inside the game using the Godot Recorder addon: https://godotengine.org/asset-library/asset/220
basically it takes pictures as I play and I use ffmpeg to stitch them up into a video and edit it using a video editor.
YT links:
https://youtu.be/aLgPsX8Cplk
Everything is in the latest update in the "Portals&Planes" branch.