This was a very different experience and i thoroughly enjoyed it... as first.
Due to the smaller brush I began to find myself more annoyed than anything else. I did like the new concept of the brush but found myself stuck several times during the game unable to find the final small piece of white to reveal. Had it been easier I think I would have enjoyed the full experience.
That all said I think this concept works really well for a mobile platform. You could potentially recreate it for IOS and Android using the player touch to brush the environment to life. I think this would work really well as it would be much easier to brush with your finger rather than hold the mouse button down and wave your wrist around :D