---

def update():
    global jump_counter, game_active, begin, PAUSE

    if not game_active:
        return

    if random.randint(0, 100) <= 3 and time.time() - begin >= PAUSE:
        create_enemy()
        begin = time.time()

    for enemy in enemies:
        enemy.x -= ENEMY_SPEED
        if enemy.x < 0:
            enemies.remove(enemy)

    if 0 < jump_counter <= JUMP_HEIGHT or (keyboard.space and player.y == START_Y):
        player.y -= JUMP_SPEED
        jump_counter += 1
    elif jump_counter > JUMP_HEIGHT:
        jump_counter = 0
    elif player.y < START_Y:
        player.y += JUMP_SPEED

    for enemy in enemies:
        enemy: Actor
        enemy_rect = Rect(enemy.x, enemy.y, ENEMY_W, ENEMY_H)
        player_rect = Rect(player.x, player.y, PLAYER_W, PLAYER_H)
        if player_rect.colliderect(enemy_rect):
            game_active = False
            break