Around 23 hours so far, 334 +48, 8 sections done. Did some of the final area but left cause my brain hurt. Now I'm back on the treetops and have completed tons of puzzles there, there's probably three times as many puzzles there as any other area.
Two puzzle complaints: once in the Marsh and once in the Treetops, there's a puzzle where it seems impossible with what you are told. After I finally solved it, the very next puzzle is like a Fisher Price tutorial for what you just completed. As far as I'm concerned, these should be swapped.
One vague audio complaint: I'm not a big fan of the audio logs, but they're mostly fine. But the audio log on top of the mountain is at least ten minutes long and I was dying by the end it. The quote was interesting in itself but completely overwrought when your player would like to move on.