Guitar Hero/Osu! mania infinite mode

sketch303869
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/**
Osu! Mania remade(4k infinite version) in under 100 lines of code
controls: d, f, j, k
the game doesn't work very well in here, it works way better if you copy the code into your IDE and run it from there
​
feel free to change or copy any of this code :)
**/
ArrayList tile = new ArrayList();
int score=0;
void setup() {
  size(400, 600);
}
void draw() {
  background(0);
​
  tiles til = new tiles(int(random(0, 3.9)));
​
  fill(#aa0000, 50);
  rect(0, 450, 400, 150);
​
  if (frameCount%10==0) {            //amount of notes generates per second, frameCount%10=6 notes/second
    tile.add(til);
  } 
  fill(#aaaaaa);
  rect(40, 0, 20, 600);
  rect(140, 0, 20, 600);
  rect(240, 0, 20, 600);
  rect(340, 0, 20, 600);
  for (int i=0; i<tile.size(); i++) {
    tiles ta = (tiles) tile.get(i);
    ta.run();
    ta.display();
    ta.move();
    if (key=='d'&&ta.location.y>430&&ta.location.x==0.0&&keyPressed) {  //d
      ta.gone=true;
    }
    if (key=='f'&&ta.location.y>430&&ta.location.x==100.0&&keyPressed) {//f
      ta.gone=true;
    }
    if (key=='j'&&ta.location.y>430&&ta.location.x==200.0&&keyPressed) {//j
      ta.gone=true;
    }
    if (key=='k'&&ta.location.y>430&&ta.location.x==300.0&&keyPressed) {//k
      ta.gone=true;
    }
    if (ta.location.y>600) {
      tile.remove(i);
      score=0;
    }
    if (ta.gone==true) {
      score+=ta.location.y>530?30:ta.location.y>480?20:10;    //scoring system(you get more points if you do better)
      tile.remove(i); 
    }
  }
  fill(#0000aa);
  textAlign(CENTER);
  textSize(50);
  text(score, 200, 530);
}
class tiles {
  PVector location;
  Boolean gone=false;
​
  tiles(int i) {
    location = new PVector(i*100, 0);
  }
​
  void run() {
    display();
    move();
  }
​
  void display() {
    fill(location.x==0?#00aaaa:location.x==100?#00aa00:location.x==200?#aaaa00:#aa00aa);
    rect(location.x, location.y, 100, 50, 40);
  }
​
  void move() {
    location.y+=5;                   //note speed, changing this will up the difficulity, putting it too high will make 
  }                                  //it literally impossible
}
​