import pygame
from random import randint

window = pygame.display.set_mode((800, 600))
pygame.display.set_caption("Тестовая игра")

running = True

while running:
    for event in pygame.event.get():
        if event.type == pygame.QUIT:
            running = False
        if event.type == pygame.KEYDOWN:
            if event.key == pygame.K_ESCAPE:
                running = False

    window.fill((randint(0, 255), randint(0, 255), randint(0, 255)))

    pygame.display.flip()