Gravity... it's a strange thing indeed. Even stranger when it goes all wonky. Ur in a world where gravity has gone haywire. U are now racing through a now upside-down inside-out world. It's up to you to get through this world as far as u can without hitting something... hitting it at extremely high speeds.
Yes, it is an endless avoid game. Avoid getting smashed into a bazillion pieces, ie. How long can u avoid before avoiding gets too hard and u become unavoided and deaded?