Simple CircuitPlayground classic game where you try to stop the LED at the right time

cp_game.ino

// a simple CircuitPlayground game by Ben Combee (age 45) and Elias Combee (age 6)

#include <Adafruit_CircuitPlayground.h>

int i = 0;
int direction = 1;
int speed = 80;

void setup() {
  CircuitPlayground.begin();
}

void win() {
  for (int j = 0; j < 2; j = j + 1) {
    for (int i = 0; i < 10; i = i + 1) {
      CircuitPlayground.setPixelColor(i, CircuitPlayground.colorWheel(i * 25));
      delay(30);
      CircuitPlayground.setPixelColor(i, 0);
    }
  }
}

void lose() {
    for (int i = 0; i < 10; i = i + 1) {
      CircuitPlayground.setPixelColor(i, 255, 0, 0);
    }
    delay(500);
    CircuitPlayground.clearPixels();
}

boolean game() {
  i = 0;
  direction = 1;
  while (1) {
    CircuitPlayground.setPixelColor(i, CircuitPlayground.colorWheel(i * 25));
    delay(speed);
  
    if (CircuitPlayground.leftButton()) {
      while (CircuitPlayground.leftButton()) { delay(1); }
      if (i == 7)
        return true;
      else
        return false;
    }
  
    CircuitPlayground.setPixelColor(i, 0);
  
    i = i + direction;
    if (i < 0) i = 9;
    if (i > 9) i = 0;
  }
}

void loop() {
  if (game() == true) {
    win();
    if (speed > 20)
      speed = speed - 10;
  }
  else {
    lose();
    if (speed < 120)
      speed = speed + 10;
  }
  delay(500);
}