INSIDE is the follow-up to LIMBO by Playdead. If you already own LIMBO on Steam (from a purchase or when LIMBO was briefly free
), you can buy INSIDE for £9.44, rather than £10.49 by buying the INSIDE + LIMBO bundle. The INSIDE + LIMBO bundle is £10.69 otherwise. According to IsThereAnyDeal, INSIDE has never been cheaper than £10.49. This deal may be too niche, but if you have LIMBO and want more, this may be your thing. INSIDE also has a demo (I wrote DEMO before I realised I was being caps-tastic).
"Hunted and alone, a boy finds himself drawn into the center of a dark project."
87% Metacritic: http://www.metacritic.com/game/pc/inside