Noby Noby Boy has no challenge and no pressure. You can't be good or bad at it; you can't win or lose. The worst thing that can happen is that Boy might get cut in two, but even then all you have to do is eat your other half and in seconds, you're back together again and good as new. There's no sophisticated artificial intelligence here, either--people are constantly falling over, walking up against walls, and behaving in other mindless ways.
And yet Noby Noby works, not in spite of all this simplicity, but because of it. Stretching Noby Noby Boy is a good way to unwind, though a few more goals to aim for may have made the experience more rewarding. Still, for a mere five bucks, Noby Noby Boy will give you a captivating and memorable experience that's different every time and is thoroughly unlike anything else you've ever played.