The best of these surprise the player and keep her just barely constantly doing something.
Proteus is wonderful. So wonderful it needs more space, variability, events, structures, animals, plants, time, music, feedback, etc.
Antichamber was more fun to play as a demo a couple of years ago. It went from purely logic puzzles to mostly cumbersome block puzzles, though the start still maintains the heavy use of proverbs+insight. Certainly a clever game, but its nonlinearity and lack of a decent navigation system cause unnecessary meandering and jerky progression. Visuals are just good enough.
Taylor Clark profiles Jonathon Blow and the state of videogames only a little hyperbolically. The Witness is apparently about existential awareness of ourselves and the world around us— using Blow’s mind and reality as the medium.