Помогите найти ошибку в игре на pygame

 import pygame 
import sys     
fps = pygame.time.Clock() 
 
pygame.init() 
screen = pygame.display.set_mode((1280, 720)) 
pygame.display.set_caption('my game') 
bg = pygame.image.load('images/bg.jpg') 
walk_rigth = [pygame.image.load('images/player/stay.png'), 
              pygame.image.load('images/player/go.png')] 
walk_left = [pygame.image.load('images/player/stay_left.png'), 
             pygame.image.load('images/player/go_left.png')] 
 
player_anim_count = 0 
bg_x = 0 
player_speed = 5 
player_x = 150 
player_y = 450 
is_jump = False 
jump_count = 10 
 
ghost = pygame.image.load('images/player/ghost.png') 
ghost_x = 800 
ghost_timer = pygame.USEREVENT + 1 
pygame.time.set_timer(ghost_timer, 3000) 
ghost_list_in_game = [] 
 
running = True 
while running: 
    screen.blit(bg, (bg_x, 0)) 
    screen.blit(bg, (bg_x + 1280, 0)) 
    player_rect = walk_left[0].get_rect(topleft=(player_x, player_y)) 
     
    if ghost_list_in_game: 
        for el in ghost_list_in_game: 
            screen.blit(ghost, el)          
            el.x -= 10 
 
            if player_rect.colliderect(el): 
                print('you lose') 
                sys.exit() 
    keys = pygame.key.get_pressed() 
    if keys[pygame.K_LEFT]: 
        screen.blit(walk_left[player_anim_count], (player_x, player_y)) 
    else: 
        screen.blit(walk_rigth[player_anim_count], (player_x, player_y)) 
 
    if keys[pygame.K_LEFT] and player_x > 50: 
        player_x -= player_speed 
    elif keys[pygame.K_RIGHT] and player_x < 1200: 
        player_x += player_speed 
 
    if not is_jump: 
        if keys[pygame.K_SPACE]: 
            is_jump = True 
    else: 
        if jump_count >= -10: 
            if jump_count > 0: 
                player_y  -= (jump_count ** 2) / 2 
            else: 
                player_y  += (jump_count ** 2) / 2 
            jump_count -= 1 
        else: 
            is_jump = False 
            jump_count = 10 
 
    if player_anim_count == 1: 
        player_anim_count = 0 
    else: 
        player_anim_count += 1 
     
    bg_x -= 5 
    if bg_x == -1280: 
        bg_x = 0 
 
    pygame.display.update() 
    for event in pygame.event.get(): 
        if event.type == pygame.QUIT: 
            running = False 
            pygame.quit() 
        if event.type == ghost_timer: 
            ghost_list_in_game.append(ghost.get_rect(topleft=(620, 520))) 
 
    fps.tick(20)