The Legend of Bum-Bo

The Legend of Bum-bo launched on November 12, 2019 to a rocky start, with Edmund McMillen and lead programmer James working intensively on bug fixes and patches throughout the weeks following launch. A free expansion was planned as a goodwill gesture toward players. Development stalled through most of 2020 due to James suffering from depression, compounded by the COVID-19 pandemic. Edmund explained the situation transparently in a developer post on November 26, 2020, announcing that a new team (Simon and Adrian, who previously worked on Binding of Isaac: Rebirth) had been brought on to help complete the planned free DLC, which would include new alt bosses, new items, a save/continue feature, and a new playable character — Bum-bo the Lost. That DLC launched on March 5, 2021 as "The Lost Expansion," delivering everything that had been promised: a new playable character (The Lost), new tile type, save/continue functionality, three new bosses, ten or more new unlockable items, and a suite of quality-of-life improvements. A follow-up bug fix patch was released on March 15, 2021. No further content has been announced or shipped since March 2021. The November 2020 post was the last developer statement about plans for the game, and those plans were fully delivered by the March 2021 expansion. There are no unreleased DLC listings, no roadmap pointing to additional content, and no developer communications indicating further development is intended. The game shipped as a complete product following the expansion, with all promised content delivered.