Limbo - “Dark, disturbing, yet eerily beautiful, Limbo is a world that deserves to be explored.” Joystiq. “Limbo is as close to perfect at what it does as a game can get.” Destructoid. Buy LIMBO: Special Edition.
Hollow Knight - Descend into the Dark Venture down into a beautiful, ruined world of insects and heroes
World of Goo - get it here | read the blog | forum.
SuperTux - SuperTux is a classic 2D jump'n run sidescroller game in a style similar to the original Super...
A Walk in the Dark - A Walk in the Dark is one of the most addictive and quite challenging Action, Puzzle-Platform and Adventure video game that takes you on an amazing journey in the world of wonders.
Super Meat Boy - Let's start with what's the same: Dr. Fetus is still a jerk, gameplay is super challenging but fair, there are tight controls and great levels and you will die. a lot.