This is a really awesome and beautiful-looking game. I spent way too long just taking screenshots of everything using the photo-mode.

My only issue with it is that a lot of the time (particularly in the wide-open areas), it's genuinely a lot harder to figure out where important stuff is than it is to solve the actual puzzles. I feel like a bit more sign-posting in these areas would be extremely beneficial, and that the more confined puzzle-room areas could be made longer and more in-depth to compensate.

Other than that though, I strongly recommend this, especially if you loved Portal or Superliminal!