Wonder if they played those levels and got just as stuck as us guys.
No idea. I remember being immensely frustrated at the first few puzzles. There are solutions to all of them on youtube though.
The one where you have to duck whilst flinging, I'm not really sure how you're supposed to work that one out...
Then I spent about 20 minutes trying to do the twitch fling up/fire portal thing a little later before I checked youtube, spent another 20 minutes attempting it then just used no_clip because I realised I simply didn't have the mouse control to successfully navigate that part of the test.
That was shortly after it came out though. I don't know if they updated it or something since then and I might be able to manage it now.