It's been a pretty long time since I played The Witness on PC (got it when it launched) and I burnt out pretty hard right before the ending, pretty much right when I
. There was a LOT of good, satisfying puzzle solving up to that point, so it was still an overall good experience.
Might be nice to go back to, and a mobile version would would be nice to just pick up and play for a bit.
My main conplaint with the game was that I felt it lacked a good story like the old Myst games (it had a good theme, but that's about it), and after a while the puzzles started to get more tiring than they were enjoyable. Puzzle concepts just started adding onto other puzzle concepts until it just became tedious trying to solve them.
I also made a LOT of use of my Note 4's stylus (my phone at the time) to take pictures of my screen and try drawing out solutions for puzzles, but I guess on my iPad I could take screencapture and draw on then with my finger if I wanted to do that again.