Proteus isn't a game, but as a digital toy:

[sesselpupser]

It's properly beautiful, though I can see why some would dislike it. If you liked Windosill or Noby Noby Boy and that sort of thing you'd probably find something to like about Proteus. It's really not a game though.

[brent.vecchi]

This is discussed in depth in the "Buyer Beware" discussion, but it's devolving pretty rapidly...