Simple count down:1

function setup() {

  createCanvas(windowWidth, windowHeight);

  background(random(pallet));

  fill(random(pallet));

  //frameRate(2);

  //noLoop()

}

const pallet = [

  "#2b2d42", "#92dce5", "#f8f7f9", "#f7ec59", "#ff66d8",

  "#000000", "#7f95d1", "#ff82a9", "#ffc0be", "#ffebe7"

];

​

let i = 30;

let number = 3;

​

function draw() {

  //let number = 3;

  background(pallet[1]);

  textAlign(CENTER, CENTER);

  textSize(i);

  text(number, width / 2, height / 2, );

  expand(number);

}

​

function expand() {

  if (number > 0) {

    if (i < 150) {

      i++

    } else {

      i = 30;

      number--;

      fill(random(pallet));

    }

  } else {

    background(pallet[6]);

    textSize(150);

    fill(pallet[3]);

    text("GO!", width / 2, height / 2, );

  }

}

​