Reaction Time Game - OpenProcessing

mySketch
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float hue;
float xPos, xSpeed;
PVector bPos; //(x, y, z)
int score = 0; // Initialize score to 0
​
void setup(){
    size(800, 500);
    background(0);
    colorMode(HSB, 100); //HUE, SAT, BRIGHT value/100
    xSpeed = 5;
    xPos = 0; 
    bPos = randomPos(); // Initialize bPos
    rectMode(CENTER);
}
​
void draw(){
    xPos += xSpeed; // Corrected the operator from +== to +=
    hue += 0.1;
    stroke(hue % 100, 100, 100);
    strokeWeight(5);
    fill(0);
    rect(width/2, height/2, width, height);
  fill(40);
  text(nf(30 - millis()/1000, 0, 2), width/2, height/2);
    line(xPos, 0, xPos, height);
    
  fill(0);
    rect(bPos.x, bPos.y, 50, 50);
    fill(hue % 100, 100, 100);
    textSize(50);
    textAlign(CENTER, CENTER);
    text(score, bPos.x, bPos.y); // Display score
    
  if (3000 - millis() <=0){
      exit();
      }
    if (xPos > width || xPos < 0){
        xSpeed = -xSpeed; //xSpeed = xSpeed * -1; xSpeed *= 1;
    }
}
​
void keyPressed(){
 if(key == ' '){
    xSpeed *= -1; 
     if(abs(bPos.x - xPos) > 25) {
         score++;
         xSpeed *= 1.1; // Increase speed by 10%
         bPos = randomPos();
     } 
 }  
}
​
PVector randomPos(){
    return new PVector(random(100, width-100), random (100, height-100), 0);
}