let y;

let xSpeed = 1;

let ySpeed; 

function setup() {

  createCanvas(400,400)

  x= width / 2

  y= height /2;

  ySpeed = (height/width)

}

​

function draw() {

  background(220);

  ellipse(x,y,20,20);

  if(x < mouseX) x+= xSpeed;

  if(x > mouseX) x-= xSpeed;

  if(y < mouseY) y+= ySpeed;

  if(y > mouseY) y-= ySpeed;

}

​