Enter The Gungeon has continued to be a success for publisher Devolver Digital with sales surpassing 3 million across all platforms. So it made sense for them to capitalize on it. Last year they released a spin-off called Exit The Gungeon. It was an exclusive to Apple Arcade which released on September 19, 2019.
Enter the Gungeon has surpassed three million copies sold and we're so thankful for the community's support!
— Enter the Gungeon (@DodgeRollGames) January 7, 2020
Unsurprisingly, Devolver is bringing that same game to PC and Console early this year. I haven’t played it myself but I heard it’s pretty great. They also announced House of the Gundead (A Light-gun arcade cabinet) will be shipping in Early 2020 as well.