I will add my comment to say that I've played most of these games, and they're all spectacular. Limbo is great, Amnesia is terrifying (to the point that I'm too scared to continue it), and I enjoyed Bastion very much too (I finished it).<p>I'm not one to game a lot, but these are so convenient (I run Linux so I rarely reboot into Windows just for a game), very casual, so you can just play one level and return to whatever you were doing, and just overall great games.