Slay the Spire's success story is a remarkable one. As one of thousands of games to land on Steam in 2017, this fusion of roguelite progression and "deckbuilding" mechanics, made by a heretofore unknown development team out of Seattle, managed to become a phenomenon due entirely to word-of-mouth. The game has since surpassed its "2.0" milestone and climbed the download charts on Xbox One, PlayStation 4, and Nintendo Switch. Yet the game has stayed an arm's length away from smartphone platforms this whole time, in spite of being built primarily using libGDX, a flexible, open source development framework with smartphone-specific hooks.