 The Binding of Isaac's main concept was the result of a weeklong game jam that McMillen had with Florian Himsl; at the time, his co-contributor on Super Meat Boy, Tommy Refenes, was on vacation. The concept McMillan had was two-fold: to develop a roguelike title based on the first The Legend of Zelda game's dungeon structure, and to develop a game that addressed McMillen's thoughts on religion. McMillen had been inspired by Shigeru Miyamoto, the designer of the original Zelda games.
