Also I vote you leave the project simple and not make decisions that will chain you to it. Art is always a reflection of ourselves in a way. You don't live for the project, the project is a result of your own aliveness.
Personally I would move on once I think my story is told. I'd grow out of it and want to tell a new story eventually (or not, you never know).
But do what feels right! I don't think it's wrong to try things.