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sketch.js

let stars = [];
let factor = 100;
let speedSlider;

function setup() {
  createCanvas(windowWidth, windowHeight);
  speedSlider = createSlider(0, 20, 2, 0.1);
  for (let i = 0; i < 500; i++) {
    stars[i] = createVector(
      random(-width*factor,width*factor), 
      random(-height*factor,height*factor), 
      random(width)
    );
    stars[i].pz = stars[i].z;
  }
}

function draw() {
  background(0);
  translate(width / 2, height / 2);
  
  for (let star of stars) {
    let x = star.x / star.z;
    let y = star.y / star.z;
    let px = star.x / star.pz;
    let py = star.y / star.pz;
    let d = map(star.z, 0, width, 10, 1);
    fill(255);
    noStroke();
    circle(x, y, d);  
    stroke(255);
    line(x, y, px, py);
    // textSize(d*2);
    // text("a", x, y);
    star.pz = star.z;
    star.z -= speedSlider.value();
    if (star.z < 1) {
      star.x = random(-width*factor,width*factor);
      star.y = random(-height*factor,height*factor);
      star.z = 400;
      star.pz = 400;
    }
  }
}