added new graphics to several maps
to level developers: level.fillBG and level.fill no longer work,
you should draw backgrounds directly in level.custom like this:
level.custom = () => {
ctx.fillStyle = "rgba(0,255,255,0.1)";
ctx.fillRect(6400, -550, 300, 350);
level.playerExitCheck();
level.exit.draw();
level.enter.draw();
};