Developer: Evenlend Games/MissScripter
AdventureOS takes your folders and the files inside them, to generate a huge castle where the folders become the rooms, staying connected to each other as usual, and the files become the NPCs, decoration, items, enemies etc, depending on their format. Yes, it can be a little difficult to imagine such an innovative concept before actually playing it.
The game works like a complex Metroidvania where getting to new levels requires exploring previous rooms, fighting enemies and solving puzzles to keep going. Your main goal is to clean all the castle's rooms from the curse casted by the Intruder. To clean a room you must set all the NPCs free by killing the creatures that keep those NPCs inside them. Once you clean a room you don't have to clean it again. But watch out! if you miss one enemy you will have to start over the next time you visit it.