A thing that could make this just a little bit better is if there was a settings button that opened the settings on the title screen, and also a setting that changes the sprites of bullets. I don't think it should be something custom but, (just looked up some references, this was written like 20 mins after ---> ) something like "The Binding of Isaac: Repentance" where the enemy bullets have a slight white aura that flashes 'behind' the bullet, I assume that when the setting is on, enemy bullet sprites are just changed to ones with the animated white aura? (IDK)