initial

enemy.py

@@ -13,7 +13,9 @@ class Enemy(pygame.sprite.Sprite):
                 random.randint(0, SCREEN_HEIGHT),
             )
         )
-        self.speed = random.randint(1, 5)
+        self.speed = random.randint(1, 2)
+    
+    
 
     def update(self):
         self.rect.move_ip(-self.speed, 0)

main.py

@@ -14,6 +14,8 @@ from pygame.locals import (
 )
 
 pygame.init()
+ADDENEMY = pygame.USEREVENT + 1
+pygame.time.set_timer(ADDENEMY, 1000)
 
 
 screen = pygame.display.set_mode((SCREEN_WIDTH, SCREEN_HEIGHT))
@@ -43,18 +45,27 @@ while running:
         elif event.type == QUIT:
             running = False
 
+        elif event.type == ADDENEMY:
+            new_enemy = Enemy()
+            enemies.add(new_enemy)
+            all_sprites.add(new_enemy)
+
     screen.fill((255, 255, 255))
     
     pressed_keys = pygame.key.get_pressed()
 
     player.update(pressed_keys)
 
-    enemy.update()
+    enemies.update()
 
     for entity in all_sprites:
         screen.blit(entity.surf, entity.rect)
 
-    # Flip the display
+    if pygame.sprite.spritecollideany(player, enemies):
+
+        player.kill()
+        running=False                           
+
     pygame.display.flip()
 
 pygame.quit()