One of the best games I've ever played. Reminds me of Portal; just a unique gameplay feature that is breathtaking; the story is exceptional too.

Never heard of it till now. Available for iPad? 

 By a rebel indie game designer, Jonathan Blow; Steam, PC/Mac, and XBox Live Arcade (originally); released a few years ago but finally got a chance to play it.

 Its been out for ages. Limbo and Machinarium are also great games