your code
shuttle(300,100,10000000);
mothership(300,500);
wall(50,200,50,400);
wall(25,200,150,200);
wall(200,200,350,200);
wall(200,400,350,400);
wall(200,200,200,400);
wall(325,200,325,400);
wall(400,200,400,400);
wall(375,200,500,200);