It was formally announced on 1 June 2015 with a simultaneous early access release on Steam to allow the gaming community to provide feedback for continual improvements and the integration of additional content over time.
Spillet blev officielt udgivet den 1. juni 2015, med en Early Access-version, udgivet for at tillade Steams fællesskab at give feedback til løbende forbedringer og integration af ekstra indhold over tid.