var y = 0; 

var xo = 100; 

var yo = 20;

​

function setup() {

  createCanvas(200, 200);

}

​

function draw() {

  background(248, 54, 168);

  ellipse(x, y, 30, 30);

  if ( keyIsDown(DOWN_ARROW) ) {

    y = y + 5;

  }

  if ( keyIsDown(UP_ARROW) ) {

    y = y - 5;

  }

  if ( keyIsDown(RIGHT_ARROW) ) {

    x = x + 5;

  }

}