I loved Monument Valley and would be delighted to find more games in that vein. What do you have in mind?
If you're specifically looking for something that fits this thread's constraint of visually stunning, one-man indie dev Escher-style puzzle game, I feel an obligation to point you at Antichamber [0].
It's got some of Echochrome's starkness to it, but with some very nice writing/dialog(?) bits that play off the game's puzzles well. Most people will find something delightful about it, though be ready for a slower paced, introspective game. It knows you know it's a puzzle game, and will punish you for it :)
(I should note that Antichamber seems to have been in development before Echochrome or Fez, and as such likely deserves the originality that has been showered on it.)
Oh, and Fez, of course.
For more modest success by an actual one-man developer, you can look at Michael Brough's games. I think he makes a living off of them now, even though they're very niche.
As far as the game experience, it's far from being in the best of its genre (and I know many game designers who agree on that point). People like it because it's artsy and lends itself nicely to casual play, which is fine. But whatever, that's besides the point- which is that it's far from a one man indie success.