Yume Nikki isn't really a suitable base for something like that. There just isn't enough enemies in the game(there's only one). The game would probably just be really boring. "If you role a six you'll get transported here when stabbing x object". *yawn* Yume Nikki's appeal is heavily based on it's atmosphere which comes from its visuals, its music and sound effects and even how everything moves and acts. You couldn't capture any of that in a table top game.