Hollow Knight - Descend into the Dark Venture down into a beautiful, ruined world of insects and heroes
Space Shooter - The classic retro game recreated using Pygame and python.
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.
AstroMenace - Cross-platform and open-source 3D space shooter with spaceship upgrades.
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.
Knytt Stories - In Knytt Stories, each level is its own little adventure.