here is the new one

var character = {

    x: 60,
    y: 60
};

var oldpos = {
oldx: 60,
oldy: 60
};

var background = getMap("map");
paper(4);

exports.update = function () {
if (background.get(character.x, character.y) ==! null) character.x = oldpos.oldx;
if (background.get(character.x, character.y) ==! null) character.y = oldpos.oldy;
oldpos.oldx = character.x;
oldpos.oldy = character.y;
    if (btn.right) character.x += 1;
    if (btn.left)  character.x -= 1;
    if (btn.up)    character.y -= 1;
    if (btn.down)  character.y += 1;

    cls();
    draw(background, 0, 0);
    sprite(206, character.x, character.y);
};