game.py

import pygame

def main():
	pygame.init()

	window = pygame.display.set_mode((500, 500))
	clock = pygame.time.Clock()

	y = 100

	while True:
		for event in pygame.event.get():
			if event.type == pygame.QUIT:
				return

		y += 1

		window.fill(pygame.color.Color(0, 0, 0))
		pygame.draw.rect(window, pygame.color.Color(255, 0, 0), pygame.Rect(100, y, 20, 20))

		pygame.display.flip()
		clock.tick(60)

main()