Press T for triangle, S for square, and H for hexagon. Fiddle around with the bars up top and see what happens. Also, up key to go up, down key to go down, right key to turn clockwise and left key to turn counterclockwise. If you want a challenge, set your Density to 1, your Area from 100-200, and try to avoid the oncoming wind as long as possible.
Way too much math.