import pygame

pygame.init()

screen = pygame.display.set_mode((640, 480))
pygame.display.set_caption("Click Score")
clock = pygame.time.Clock()

BG    = (15, 30, 50)
WHITE = (255, 255, 255)

font  = pygame.font.SysFont(None, 56)
score = 0

running = True
while running:
    for event in pygame.event.get():
        if event.type == pygame.QUIT:
            running = False
        elif event.type == pygame.MOUSEBUTTONDOWN:
            score += 1

    screen.fill(BG)

    score_surf = font.render(f"Score: {score}", True, WHITE)
    screen.blit(score_surf, (20, 20))

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

pygame.quit()