Почему не появляется окно программы?

Пытался сделать тест скорости набора текста, но почему то окно не появляется, что делать? Вот код:

import pygame
from pygame.locals import *
import sys
import time
import random

class Game:
    def __init__(self):
        self.w = 750
        self.h = 500
        self.reset = True
        self.active = False
        self.input_text = ''
        self.word = ''
        self.time_start = 0
        self.total_time = 0
        self.accuracy = '0%'
        self.results = 'Time:0 Accuracy:0 % Wpm:0 '
        self.wpm = 0
        self.end = False
        self.HEAD_C = (255, 213, 102)
        self.TEXT_C = (240, 240, 240)
        self.RESULT_C = (255, 70, 70)
        pygame.init()
        self.open_img = pygame.image.load('Joystick.png')
        self.open_img = pygame.transform.scale(self.open_img, (self.w, self.h))
        self.bg = pygame.image.load('polygon-background.jpg')
        self.bg = pygame.transform.scale(self.bg, (500, 750))
        self.screen = pygame.display.set_mode((self.w, self.h))
    pygame.display.set_caption('Tecт скорости набора текста')


def draw_text(self, screen, msg, y, fsize, color):
    font = pygame.font.Font(None, fsize)
    text = font.render(msg, 1, color)
    text_rect = text.get_rect(center=(self.w / 2, y))
    screen.blit(text, text_rect)
    pygame.display.update()


def get_sentence(self):
    f = open('sentences.txt').read()
    sentences = f.split('\n')
    sentence = random.choice(sentences)
    return sentence


def show_results(self, screen):
    if (not self.end):
        self.total_time = time.time() - self.time_start
        count = 0
        for i, c in enumerate(self.word):
            try:
                if self.input_text[i] == c:
                    count += 1
            except:
                pass
        self.accuracy = count / len(self.word) * 100
        self.wpm = len(self.input_text) * 60 / (5 * self.total_time)
        self.end = True
        print(self.total_time)
        self.results = 'Time:' + str(round(self.total_time)) + " secs Accuracy:" + str(
            round(self.accuracy)) + "%" + ' Wpm: ' + str(round(self.wpm))
        self.time_img = pygame.image.load('icon.png')
        self.time_img = pygame.transform.scale(self.time_img, (150, 150))
        screen.blit(self.time_img, (self.w / 2 - 75, self.h - 140))
        self.draw_text(screen, "Reset", self.h - 70, 26, (100, 100, 100))
        print(self.results)
        pygame.display.update()


def run(self):
    self.reset_game()
    self.running = True
    while (self.running):
        clock = pygame.time.Clock()
        self.screen.fill((0, 0, 0), (50, 250, 650, 50))
        pygame.draw.rect(self.screen, self.HEAD_C, (50, 250, 650, 50), 2)
        self.draw_text(self.screen, self.input_text, 274, 26, (250, 250, 250))
        pygame.display.update()
        for event in pygame.event.get():
            if event.type == QUIT:
                self.running = False
                sys.exit()
            elif event.type == pygame.MOUSEBUTTONUP:
                x, y = pygame.mouse.get_pos()
                if (x >= 50 and x <= 650 and y >= 250 and y <= 300):
                    self.active = True
                    self.input_text = ''
                    self.time_start = time.time()
                    if (x >= 310 and x <= 510 and y >= 390 and self.end):
                        self.reset_game()
                    x, y = pygame.mouse.get_pos()
            elif event.type == pygame.KEYDOWN:
                if self.active and not self.end:
                    if event.key == pygame.K_RETURN:
                        print(self.input_text)
                        self.show_results(self.screen)
                        print(self.results)
                        self.draw_text(self.screen, self.results, 350, 28, self.RESULT_C)
                        self.end = True
                    elif event.key == pygame.K_BACKSPACE:
                        self.input_text = self.input_text[:-1]
                    else:
                        try:
                            self.input_text += event.unicode
                        except:
                            pass
        pygame.display.update()
    clock.tick(60)


def reset_game(self):
    self.screen.blit(self.open_img, (0, 0))
    pygame.display.update()
    time.sleep(1)
    self.reset = False
    self.end = False
    self.input_text = ''
    self.word = ''
    self.time_start = 0
    self.total_time = 0
    self.wpm = 0
    self.word = self.get_sentence()
    if (not self.word): self.reset_game()
    self.screen.fill((0, 0, 0))
    self.screen.blit(self.bg, (0, 0))
    msg = "Тест скорости набора текста"
    self.draw_text(self.screen, msg, 80, 80, self.HEAD_C)
    pygame.draw.rect(self.screen, (255, 192, 25), (50, 250, 650, 50), 2)
    self.draw_text(self.screen, self.word, 200, 28, self.TEXT_C)
    pygame.display.update()

pygame.quit()