Turbo mode is recommended, (Shift + Green Flag) but not needed. Wait until it asks you a question, and answer. It asks you how many flower petals you want. Answer and watch! This is like @leszpio's game, Pretty Flower, but I made mine myself.
I just had a quick look at @leszpio's scripts, and I understood. So I decided to make it myself instead of remixing. Oh yeah, when it asks you how many petals, some good choices are: 5.5, 2.5 and 56.5. These are my best choices. I'm not giving you anymore because I want you to experiment! Find your best ones :)