Just move your cursor around and see what happens :) Also don't forget to stand still with your mouse. After a while the flower will grow even further! The properties of the shapes are fully customizable in the sprite called 'Customize'. Just mess around with numbers in the blocks and see for yourself. I think the default settings make for some pretty nice shapes.
This game is made in one day. I have been messing around with the pen tool since yesterday, found out what it was and now I made this. All skins are made by me, just like the code. If you stumble upon any bugs, tell me in the comments. I read all of them. If you can think of a nice way to remix this, please do. I'd love to see someone use this to make a better pattern or whatsoever.