Run your code, then check each checkpoint before moving on.

1. 1. Move ship, fire bullets.

   Not checked
   Tip: keyboard movement pattern

   Example pattern (not the full solution):

   keys = pygame.key.get_pressed()
   if keys[pygame.K_LEFT]:
       player.x -= speed
   if keys[pygame.K_RIGHT]:
       player.x += speed

2. 2. Spawn enemies.

   Not checked
   Tip: timed spawn pattern

   Example pattern (not the full solution):

   spawn_timer += 1
   if spawn_timer >= 30:
       spawn_timer = 0
       objects.append(make_object(random.randint(0, W - 20)))

3. 3. Hit enemies for score.

   Not checked
   Tip: collision check pattern

   Example pattern (not the full solution):

   for obstacle in obstacles:
       if player.colliderect(obstacle):
           game_over = True

4. 4. Lose lives on misses/hits.

   Not checked
   Tip: lives system pattern

   Example pattern (not the full solution):

   if missed_target:
       lives -= 1
   if lives <= 0:
       game_over = True