The cassette tapes and clips in the movie theater were my favorite part of the game (still haven't unlocked them all)

That's fair - to each their own. For me personally my favorite thing was finding those lines of "tutorial puzzles" that teach you how certain rules work, and suddenly realizing how other puzzles could be solved - I got goosebumps from that a lot of times. One thing can be said for certain, it's a great game - unfortunately not the best replay value though IMO, because you tend not to forget the puzzle rules once you figure them out (similar to Outer Wilds in this aspect).

Agree, the game is like a meditation on the nature of learning and perception. These realizations ("Is that just a tree or ...?") also gave me goosebumps.