It gave me so much joy to hear that the flying ability reminded you of glados as the writing in portal is my all time favorite :)
I'm planning to restructure the levels to at least move harder gauntlets to optional endings closer to the end of the game and not open with them as this has been reported multiple times. I like the idea of having a bit more warning on the falling objects, I'll definitely look into that.
I wholeheartedly agree that having a more precise controller would be better and will put it on my to-do list.
On the collision detection could you have meant the setting in the rigidbodies called collision detection? I forgot to set to continuous on the fake scripts and files which I just changed on my local build. The player already had this but if you could tell me if the collisions felt iffy elsewhere that would be great.
I did try to limit the screen shake and tied it to player downward momentum so they would not get it when stepping down or something. I'll look into decreasing it further.
Thank you so much for playing and for the kind, detailed and constructive feedback! It really means a lot<3