Just click to make a little shape appear. They will cluster around the original one in a circle and spread out towards the edge (move) steps. Every (blink) seconds, it will change the color effect by (color). The size can be changed by moving the "Size" variable. It is the same way with the others. Use the arrow keys to move. "Randomize" sets all the variables to a random number (obviously). And pen changes the shape of the little thingy that you "draw" with. You can have a circle, a sun-thingy, a square, and a square with little branches. (:
Have fun! I did everything myself, but I got the idea from an app called "Art of Glow". (: Also... One really fun thing you can do is click "Randomize" over and over again really quickly. It creates a shape, but it's COMPLETELY random every time! It looks really cool. (: