Press the load button then press the space bar to start the simulation. The shape will move forever.
I honestly have no idea how this works. It might be because the vertices are wiggling. I was messing around with the simulation and made a shape. After I moved one of the points of the shape, it became this and started moving. As far as I'm aware, there's no way to stop the movement, so it will fly around forever. It also looks like some sort of animal head, like a fox or cat. I did not make this physics engine, this is just an entry for the competition.