Games directly inspired by or at least vaguely reminiscent of The Witness for any reason.
Expect any combination of line drawing puzzles, environmental puzzles, and rule learning mechanics.
More beyond Itch.io:
Here's also a related compilation from someone else.
The ultimate witnesslike
abstract, taiji grid puzzles. I made this one
line drawing puzzles, cute mechanic
Line drawing puzzles
cool line drawing puzzles, with a little bit of state!
Environmental, taiji grid puzzles
yume nikki-inspired map of graph puzzles
prototype version of Cipher Zero, listed in the description
Often compared to The Witness - similar vibes, but the gameplay is actually very different
