GRAViTY is a simple abstract puzzle game that uses graviational forces to move game objects around. It was developed by Christian Coppoletti, Megan Linard, JC Statt and Ash Nieman. The goal of the game is to return a lost blue particle to its blue safe zone. There are obstacles, dangerous zones, and dangerous particles, and many other elements that interfere with and complicate that goal.
The game can be downloaded here (for OSX and Windows).