Gamefly end of the world sale

GameFly’s End of the World event takes 75 percent off select titles for the next 12 days, providing valuable buys such as Witcher 2 for $15, a XCOM: Enemy Unknown $25, The Walking Dead for $12.50, Star Wars: Knights of the Old Republic for $2.50, Batman: Arkham Asylum for $10, and Crysis for $7.50.
More games will appear throughout the sale’s duration.
http://www.gamefly.com/download-games/browse/?ids=5003898,5003963,150980,5000948,150105,150360,5003915,5004241,150175,5004637&page=1&pageSize=78#.UMZ9mYPAeAY

Does anyone know if games purchased from Gamefly work on Steam?