How it was made: according to the AI disclosure on the game's Steam page, generative AI tools helped produce Murciavania's visual assets and music, and the illustrations, sprites, icons, backgrounds and scenery went through review and adjustment during development before going into the game. The disclosure says AI also assisted with code, room design, writing and translation, directed by Manzano and checked through editing and testing. Sound effects are made in code. All of this is done before release: the disclosure says nothing is generated while you play and the game doesn't connect to any outside AI service. It doesn't name the AI tools used.
The game has been patched heavily since launch. Its Steam news page shows 34 version updates between October 30 and November 11, from 1.2 to 2.1.5. Version 2.0, posted November 5, added The Keys of the Valley at no charge. Many of the later notes thank players by name for problems they raised in the Steam Discussions; fixes include solved riddles that were forgotten after loading a save, a Continue option that only checked the first save slot, characters drawn far too large, and new illustrations for the true ending's epilogues.
