Right now it's the Steam Exploration Sale which last until 1st december 10 AM and lot of stuff is on discount.
A few game that caugh my eyes and deserve to be mentionned (maybe?) are :
The Banner Saga, Creeper World 3, Rogue Legacy, Ori and the Blind Forest, Shovel Knight, Freedom Planet, One Way Heroics, many Neptunia games, ...
Ah, you should probably have a look. XD