this is something I said a long time ago. Renpy doesn't work for this kind of game they have in mind, this large world with several places to visit, RPG combat mechanic, RPG stats, RPG story and so on, for which RPG Maker is ideal and they already had experience with that engine. Even with RPG maker you can customize alot, you can make your own tiles, parallax maps and much more. Renpy is the engine for virtual books that have some kind of branching and just want to tell you an interactive story.