pygame code

import random
import pygame

pygame.init()
#screen
bg=pygame.display.set_mode((600,420))
#title of the window
pygame.display.set_caption('The KeyBoard Game')
#fonts
fnt1=pygame.font.SysFont('jokerman',40)
fnt2=pygame.font.SysFont('algerian',30)
fnt3=pygame.font.SysFont('constantia',50)
#GAME NAME
txt1=fnt1.render('THE KEY BOARD GAME',True,'white')

#start button
start=fnt2.render('start',True,'white')
start_rect=start.get_rect(topleft=(247,160))

#menu screen
def menu():
    bg.fill('#00011c')
    bg.blit(txt1,(80,60))
    bg.blit(start,start_rect)

#game material
cyan=(79,173,242)
key_name=['A','B','C','D','E','F','G','H','I','J','K','L','M','N','O','P','Q'
          ,'R','S','T','U','V','W','X','Y','Z','1','2','3','4','5','6','7','8','9','0']
sound=pygame.mixer.Sound('my sounds/buzzer sound py.wav')

score=0
txt=fnt3.render('press the following key',True,'#00011c')
exit=fnt2.render('exit',True,'#00011c')
exit_rect=exit.get_rect(topleft=(20,20))

#game screen
def game(random_keys):
    bg.fill(cyan)
    bg.blit(txt,(60,100))

    key_txt=fnt3.render(random_keys,True,'#00011c')
    bg.blit(key_txt,(270,200))

    pygame.draw.rect(bg,'white',(12,20,80,40))
    bg.blit(exit,exit_rect)

    pygame.draw.rect(bg,'white',(440,20,150,40))
    score_txt=fnt2.render(f'score: {score}',True,'#00011c')
    bg.blit(score_txt,(440,20))


screen1=True
screen2=False

#menu screen loop
while screen1:
    for event in pygame.event.get():
        if event.type==pygame.QUIT:
            screen1=False
        if event.type==pygame.MOUSEBUTTONDOWN:
            if start_rect.collidepoint(event.pos):
                screen1=False
                screen2=True
    menu()
    pygame.display.update()

#default key
random_keys='Q'

#game screen loop
while screen2:

    for event in pygame.event.get():
        if event.type==pygame.QUIT:
            screen2=True
        
    
    game(random_keys)        
    pygame.display.update()
    event = pygame.event.wait()
    if event.type==pygame.KEYDOWN:
        if event.key == pygame.KEYDOWN and event.unicode.upper() == random_keys:
            random_keys=random.choice(key_name)
            score+=1
        elif event.key != pygame.KEYDOWN and event.unicode.upper() != random_keys:
            sound.play()
        else:
            random_keys=random.choice(key_name)
            score+=1
            
    if event.type==pygame.QUIT:
        sound.stop()

    if event.type==pygame.MOUSEBUTTONDOWN:
            if exit_rect.collidepoint(event.pos):
                screen2=False
                screen1=True
            
pygame.quit()