Games like The Müll Littoral

If you finished The Müll Littoral, the closest matches are The Inner World: The Last Wind Monk, The Secret Monster Society: Chapter 1 - Monsters, Fires and Forbidden Forests, Fault Milestone Two Side: Above, AdventureQuest Worlds and Doom & Destiny Advanced. All 8 share its adventure genre and are ranked by how closely their themes and modes overlap.