Good, but needs more options

I like this app, but there are a few things keeping me from giving it 5 stars. I would like a way to turn the firework effect on or off, and I want to control the color changing effect. I would also like there to be an option to let ghost lines (the afterimage the lines leave when suddenly zoomed out) linger for a while before fading. If these changes were made, it would definitely be a 5 star app.

Kethura about Geometrica Visualizer - Stunning Wallpapers, Glowing Particles and Fireworks