yeah, playing more than 30 minutes (after you got into the grove of things, so anytime after the first time playing) ends up getting boring. I like the game for how it builds different worlds randomly to mess around with. If it was a bunch of pre-made worlds what you just eat stuff, then that would be even more boring. Half the 'fun' is just seeing the different types of worlds the game makes. It's a bit like Doctor Who where you just go around and see how different worlds do their thing. That part is the interesting part, not so much the boy gameplay, which is at least somewhat entertaining.
I'd much rather see something similar in a Mass Effect or other space/exploration based game. Going to different areas and seeing how the world kinda works (often times madness in Noby Noby Boy) is so great.