sketch.js

let cor;
let circuloX;
let circuloY;
let contador;

function setup() {
   createCanvas (400,400);
  background(color( 100,0,0))
  cor = color(random(0,255), random(0,255),random (0,255));
  circuloX = [0,0,0,0,0,0];
  circuloY=[random(height),random(height),random(height),random(height),random(height),random(height)];
}         
 
function draw(){
  fill(cor);
  for (contador in circuloX){
    circle(circuloX[contador],circuloY[contador],50);
    circuloX[contador]+= random(0,3);
    circuloY[contador]+=random(-3,3);
    if (circuloX[contador]>=width) {
      circuloX[contador]= 0;
      circuloY[contador]=random(height);
    }
  }
  if( mouseIsPressed){
cor = color (random (0,255),random(0,255), random(0,255),random (0,100));
  }
}