我的暂停显示如何在Pygame中正常工作？

import pygame
import sys

pygame.init()

# 游戏窗口大小
screen_width = 800
screen_height = 600
screen = pygame.display.set_mode((screen_width, screen_height))
pygame.display.set_caption("My Game")

clock = pygame.time.Clock()
paused = False

while True:
    for event in pygame.event.get():
        if event.type == pygame.QUIT:
            pygame.quit()
            sys.exit()
        elif event.type == pygame.KEYDOWN:
            if event.key == pygame.K_SPACE:
                paused = not paused  # 切换暂停状态

    if not paused:
        # 游戏逻辑更新
        # ...

        # 绘制画面
        screen.fill((255, 255, 255))
        # ...

        pygame.display.flip()

    clock.tick(60)  # 设置帧率为60