Thank you! I used as engine turbowarp which is an mod of the original scratch, so for example in Turbowarp I can make the screen 84x48 but in the original Scratch I can't.
I kind of ran out of time to make a restart button or a return to main menu button so I chose the flag option which is an common thing to do if you use Scratch (because its mostly the easiest way). So thats why!