all that you could really control is the turbo (shift-click the flag to toggle turbo-mode) --- but now you also can change background! press ::SPACE:: to make it rectangle, like in original version.
the music is Alt-J -- Tessellate (acoustic from soundcloud). It's been awhile since I last have been on Scratch. I have changed tremendously. This project is my attempt to "try to make something". feel free to examine the scripts. EDIT: I added dynamic background :-/ EDIT2: I made it play two sequences; rectangle first, then it does squiggley.