The Binding of Isaac has reached 2 million in sales. McMillen noted his surprise at the game's steady success, having first launched in September 2011, on an episode of the Northernlion gaming channel on YouTube.
"In the first year we sold a million copies, and now we're already up to two million," McMillen said. He also discussed the Nicalis "demake" of the game, The Binding of Isaac: Rebirth, and the definite inclusion of the Mystery Man unlockable character. The Mystery Man will use randomly-generated items and stats, offering a new challenge to players each time he's selected. McMillen also elaborated on the constraints that Flash presented in developing the game, and how Rebirth would benefit from fewer performance issues.