After it generates click where you think the light source is. Try to get the light source in the middle of the purple circle. The lower your score the better. It takes on average 4.257 seconds to generate. If you want to know how long it took to generate your then press space.
This is kinda just a copy of the game Shadows by @MrSquirrelDeDuck, I just wanted to make it faster. Also sometimes the shadows round off at the end when they are too big, I'm working on a way to fix that. Code by me Idea by @MrSquirrelDeDuck