Hat World is an incredible freeware yuri themed doujin RPG where you choose one of six main characters and play through their unique campaigns. It has an exceptionally good turn-based battle system, some very challenging boss fights, sidescrolling platformer exploration, and great storytelling, visuals, and music all throughout.

Hat World got a high quality fan translation last year and you can download it here:
https://mega.nz/folder/09FRHYSR#VKxBWy9oTNffPNJlnvsEBA

Rumors are this game is coming to Steam soon