Not sure if you have given them a try yet, but I found the Echochrome demo quite entertaining. I ended up buying the full game. The whole "perspective" concept feels very original and the puzzles are challenging at times.
Dark Sector demo is also out. The initial review made it not look too interesting, but the demo says otherwise. I really like it. It is third person and has some interesting elements. Very nice graphics, but semi-simple overall gameplay (at least in the demo). There are enough elements in it to discover that make it a worthwhile download just to check out.
