Into the Breach is a minimalist Mechs vs Monsters tactics game with elements inspired by the roguelike genre. In many ways, the creation of Into the Breach was a direct response to Subset Games' experience creating FTL, however, its development was anything but straightforward. Through much trial and error, it took over two years of prototyping to settle on the basic structure of the game. In this talk, Justin will explore some of the twists and turns Into the Breach took on its way towards completion. He will focus on the design challenges, the reasoning behind their choices, and lessons to take away from their experience.