I love to be surprised by ingenuity in game concepts, and the upcoming Blek by a team of brothers in Vienna certainly qualifies. I could explain how you collect dots by using gesture input, but that wouldn't sound very impressive, so I'll let the trailer explain things instead.
One can only imagine the horrors awaiting in the later levels. Nevertheless, it looks like a fantastic new brand of puzzle game. It's out next week on December 3rd for the iPad. You best start practising your swiping in a straight line now.