colour shift - OpenProcessing

mySketch
colourBlock
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void setup() {
  
  background(10, 5, 25);
  size(540, 1000);
  blocks.add(new colourBlock());
  
}
​
boolean isYellow = false;
​
boolean isStart = false;
​
int lives = 50;
int score = 0;
​
int tick;
​
void draw() {
  
  strokeWeight(20);
  stroke(50, 90, 255);
  if (isYellow) {
    stroke(205, 240, 20);
  }
  fill(0, 20);
  rect(0, 0, width, height);
  
  fill(50, 90, 255);
  if (isYellow) {
    fill(205, 240, 20);
  }
  rect(0, 0, width, 100);
  
  if (isStart) {
    
    for (colourBlock block : blocks) {
      block.render();
    }
    
    tick++;
  
    if (tick % 15 == 0) {
      blocks.add(new colourBlock());
    }
    
    fill(255, 255, 255);
    
    textSize(50);
    textAlign(CENTER, TOP);
    text("Lives: " + str(lives), width / 2, 0);
    text("Score: " + str(score), width / 2, 50);
    
  }
  
}
​
void keyPressed() {
  
  if (key == ' ') {
    
    isYellow = !isYellow;
    
  }
  
  if (key == 'a') {
    
    isYellow = false;
    
  }
  
  if (key == 'd') {
    
    isYellow = true;
    
  }
  
  isStart = true;
  
}
​
void mouseClicked() {
  
  isStart = true;
  
}