PLEASE give the option to disable that flashing line that goes across the screen, it is annoying at best and seisure-inducing at worst.
Huh, interesting. There definitely isn't an effect like that in the game, and this is the first time I am hearing about it. The closest thing I can think of is maybe the clouds or fireflies are rendering improperly? Or maybe it's a problem with the way Gamemaker games run on your machine? If the ladder is the case it may be out of my hands unfortunately.