Ether

You play as a cloudlike entity who gradually forms into a creature and gains powers as it shows mastery of the world it is creating. You are opposed by the world itself, because it doesn't want you to leave. "Evil" enters the world. There are some puzzles that take advantage of your ability to move up and down, but they are not the focus of the game. The mood is impressionistic. You are a god-nautilus, and you are exploring your capabilities and making sacrifices and enjoying being in the world.