Randomly on IndieDB, you might stumble across this new Portal-inspired, fps-style 3D puzzler called TRI 2 (EDIT: as of Jun 15, 2012, the name has been reverted back to “TRI”. NEW LINK ). Basically, you create triangles in a 3D environment to help you solve puzzles and get through the world. It’s easier than it sounds (and harder than it looks, I imagine). You’re given a little glowing ball that stays attached to the surfaces you point at, allowing you to choose the vertexes to place your triangles (sorry, you can’t make free-standing triangles).
The game has a potential M. C. Escher feel to it initially, given some of the artwork. I said potential; if the designers go in that direction, it would be REALLY cool. The gameplay allows for it: you can practically walk on the ceiling given certain circumstances. Level design is also hinted at in the artwork and latest rendered images.
The creators decided to base it around a story: a “thief” traveling to an island to get treasures for his buyers. So pretty much, you’re a treasure hunter, and they hint at you not being alone on this island.
From the looks of it, the game has a good start, at least as far as game-play, but we’ll have to wait an see how far they progress with this.
EDIT (3/11/2013): There latest update was on Mar 3, 2013. The game is looking pretty good.