fix delta time math of black hole physics

games/redbricks/game.js

@@ -11,7 +11,7 @@ function load() {
  const gameSize = new Point(240, 240);
  const playfield = new Playfield("playfield", gameSize);
  let deathCount = 0;
- let level = 1;
+ let level = 4;
 
  let startTime;
  function introduceLevel() {
@@ -80,7 +80,7 @@ class Game {
  this.killBlocks = [];
 
  this.blackHoles = [];
- this.blackHolePower = 500;
+ this.blackHolePower = 5;
 
  // Paddle
  this.paddle = this.playfield.addEntity({
@@ -146,8 +146,8 @@ class Game {
  } else {
  this.blackHoles.forEach((hole) => {
  const distance = hole.position.x - this.ball.x;
- const dt2 = dt*dt*this.blackHolePower;
- this.ball.velocity.x += distance * dt2;
+ const scale = dt * this.blackHolePower * Math.exp(-dt);
+ this.ball.velocity.x += distance * scale;
  });
 
  const nextBallPos = () => {