I just finished Talos Principle. The game has gotten great reviews and, IMHO, they are well deserved. It's a bit of a cross between Portal and the System/BioShock games. You're running around, solving puzzles while picking up bits and pieces of a story explaining what the frak is going on.
The puzzles are definitely the main attraction. You'll be using various tools (five by the end of the game) to solve puzzles that will give you access to a sigil, which is just a little tetris-like puzzle piece. You use these puzzle pieces to gain access to more tools and areas. I only found one puzzle that was timed (and failing it a couple of times brought on a little more dialog so I think I was meant to fail at least once). None of them require hair trigger timing, either. Your raw capability is going to be tested here, not your reflexes or your ability to think under pressure.
There are also stars spread around that act as extra hard puzzles. You'll often need to do some exploration just to find out where they are, never mind how to get them. There are a few easter eggs scattered around, too, to encourage more exploration.
The philosophy aspect of the game didn't work out as well for me. You get asked some good questions but your forced to pick from a few, short answers. Philosophy and short answers just don't go together. I found myself really wishing I could just type my answers and have the game pick that apart but I guess the technology just isn't up to it.
Save games left me a little cold, too. All the game seems to be saving is what puzzles you've solved, what you've read, and where you're standing. If you have a puzzle half finished then quit the game, you'll have to start over again. Luckily, once you know what you're supposed to do a puzzle only takes a couple of minutes to re-do so it's no big loss as long as you don't put the game down for weeks.
The graphics are quite pretty and the music is very well done. Total playing time for me was 30 hours but that's going to vary a lot by how quickly you figure out the puzzles (IF you can figure them all out).
The game is very subject to spoilers. You're obviously going to be tempted to just look up answers to the puzzles. Don't! Just sleep on it. It's amazing how much easier a puzzle can be the next day. (Maybe because the game is making you so much smarter? Yeah, I think that's the best choice to believe in.
) The story can be easily spoiled, too. Honestly, even the game's own trailers seem to give away too much IMHO.
So big thumbs up for this game to anyone who enjoys spatial puzzles.