While I feel the game has some real neat concepts and it was a cool experience, it has been short-lived for me.
While it is fine to talk about truly emergent or free-form gameplay, it ultimately means that I really do not feel like playing any more once the novelty wears off. For me games without real goals loose my interest much faster than games without much in the way of structure.
The guys talked a while back about how they enjoyed just getting in a flight sim with no goals and just making up their own goals. I used to be in the same boat. However that sort of experience did not last long for me. After spending a few hours flying around, I would want something to achieve or a new aspect to explore.
TLDR: Noby Noby Boy was a cool experience, but it lacks any staying power for me due to the lack of structure or goals to achieve.