The Portal games really are something special. They had a big impact on me around the time they came out--hell, I'm still driving the same white Prius that I put Aperture Laboratories fleet car markings on back in the day. Watching you go through them has been like re-experiencing their magic for myself, easily the most enjoyable playthrough I've watched of either game.
I know you meant to say "cooperative" when you mentioned the "community" test chambers, but I would definitely encourage you to check out the community maps as well, even if not on-screen. There are some fantastic maps out there, and you might even try your hand at making one yourself using the built-in puzzle creator tool! It's very intuitive and easy to use; I had a lot of fun with it back in the day, and I suspect with your logical mind you might as well.
Looking forward to what's next!