Python: Wieso wird bei diesem Skript keine Rückmeldung angezeigt?

Ich wollte nur fragen, was an diesem Python-Skript falsch ist. Es wird nur keine Rückmeldung angezeigt:

import pygame

# Initialisierung von Pygame
pygame.init()

# Fenstergröße festlegen
window_width = 800
window_height = 600
window = pygame.display.set_mode((window_width, window_height))
pygame.display.set_caption("Plattform-Spiel")

# Farben definieren
black = (0, 0, 0)
white = (255, 255, 255)

# Spielergröße und Position
player_width = 50
player_height = 50
player_x = window_width // 2 - player_width // 2
player_y = window_height - player_height

# Spielerbewegung
player_x_speed = 0
player_y_speed = 0
player_jump_power = -10
gravity = 0.5

# Plattformgröße und Position
platform_width = 200
platform_height = 20
platform_x = window_width // 2 - platform_width // 2
platform_y = window_height - platform_height - 50

# Hauptspielschleife
running = True

while running:
  window.fill(white)

  # Ereignisse verarbeiten
  for event in pygame.event.get():
    if event.type == pygame.QUIT:
      running = False
    elif event.type == pygame.KEYDOWN:
      if event.key == pygame.K_LEFT:
        player_x_speed = -5
      elif event.key == pygame.K_RIGHT:
        player_x_speed = 5
      elif event.key == pygame.K_SPACE:
        if player_y == window_height - player_height:
          player_y_speed = player_jump_power
    elif event.type == pygame.KEYUP:
      if event.key == pygame.K_LEFT or event.key == pygame.K_RIGHT:
        player_x_speed = 0

  # Spielerbewegung aktualisieren
  player_x += player_x_speed
  player_y += player_y_speed
  player_y_speed += gravity

  # Kollisionserkennung mit Plattform
  if player_y + player_height >= platform_y and player_y_speed >= 0:
    if player_x + player_width >= platform_x and player_x <= platform_x + platform_width:
      player_y = platform_y - player_height
      player_y_speed = 0

  # Spieler zeichnen
  pygame.draw.rect(window, black, (player_x, player_y, player_width, player_height))

  # Plattform zeichnen
  pygame.draw.rect(window, black, (platform_x, platform_y, platform_width, platform_height))

  # Fenster aktualisieren
  pygame.display.flip()

# Pygame beenden
pygame.quit()
Python, Python 3, Pygame
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