Another browser game for today. This one's called SHIFT and it's actually quite unique. Like every second casual game these days it rampantly burglarises a lot of its cool from Portal but it's all justified in the context of an absolute gem of a central game mechanic and some extremely solid level design.
Unfortunately explaining the core concept ruins one of the early moments in the game, so I'm going to let you discover it for yourself. However, I can say that it's a platformer (my arch-nemesis) and yet I loved it to pieces.
You should go investigate for yourself. It's really very clever.