This game has no business being this good for a game jam! I'm of the hot take that the Portal games and pretty much everything in the 3D puzzle platforming genre is overrated, but I was in awe playing this, seeing how much you've managed to put together in one week.
I liked the Claptrap-style humor being fed to you throughout! The music was nice and you had some beautiful environments! The end of the air purification course looked really nice!
But the highlight for me was entering the Kurosawa mode course (don't remember the name) after that! I genuinely paused and just looked at the environment for a good minute before proceeding! It had some nice sound design also!
The gravity course was... well, Hidetaka Miyazaki would have been proud for sure! I liked that you added some ways to get back to the start if (when) you screw up, like the boost pad pushing you to the very start. Figuring out some more ways to be able to skip parts of it once you've progressed could be a nice touch. Maybe some Bloodborne-style shortcuts that connect a later point to the start, but only once you've managed to reach it? Also, the crane felt somewhat mistimed with the vehicle, which sometimes forced me to wait 2-3 rotations before being able to make the jump.
Full disclosure: I'm currently traveling, and I had to play it all using the trackpad of my laptop. I know the game is not designed to be played like that, but it really made me wish for a way to at least change the aiming sensitivity after having started the game. But I'm sure you're planning on adding that anyway!
I was sure that I could make it through my travels without a mouse, but now I have to go and buy one just to make it through the gravity course. Failing the very last (I think, I hope) jump the third time felt like a sign from above. So consider this a review in progress!