Just move your mouse around and have fun. Use the Distance slider to change the blur radius/distance. The opacity slider causes lag when too high, it is just to add more opacity/stamps onto the render. Moving the blur sprites ontop of each other will make a cool blend effect I don't understand yet.
Made by creepersaur/superfisher this is a version for glowing effect aka bloom PLAY WITH TURBOWARP: https://turbowarp.org/782702540?hqpen&fps=60