Só pela imagem eu já senti uma nostalgia incrível de quando eu tinha uns 6/7 anos e jogava um jogo parecido com esse no PS2. Também uns 2 anos depois eu joguei bastante no Click Jogos.

Eu fui tentar jogar e aconteceu um erro, olha:

Rodando pela linha de comando aparece o mesmo erro. Se esse código de erro possa te ajudar a resolver, aqui está ele completo:

Traceback (most recent call last):
  File "main.py", line 1, in <module>
    from game import runGame
  File "<frozen importlib._bootstrap>", line 1027, in _find_and_load
  File "<frozen importlib._bootstrap>", line 1006, in _find_and_load_unlocked
  File "<frozen importlib._bootstrap>", line 688, in _load_unlocked
  File "PyInstaller\loader\pyimod02_importers.py", line 499, in exec_module
  File "game.py", line 3, in <module>
    from functions import drawHUD, displayScreen, addFuel
  File "<frozen importlib._bootstrap>", line 1027, in _find_and_load
  File "<frozen importlib._bootstrap>", line 1006, in _find_and_load_unlocked
  File "<frozen importlib._bootstrap>", line 688, in _load_unlocked
  File "PyInstaller\loader\pyimod02_importers.py", line 499, in exec_module
  File "functions.py", line 8, in <module>
    from sounds import explosionSound, collectFuelSound
  File "<frozen importlib._bootstrap>", line 1027, in _find_and_load
  File "<frozen importlib._bootstrap>", line 1006, in _find_and_load_unlocked
  File "<frozen importlib._bootstrap>", line 688, in _load_unlocked
  File "PyInstaller\loader\pyimod02_importers.py", line 499, in exec_module
  File "sounds.py", line 5, in <module>
    explosionSound = pygame.mixer.Sound('sounds/explosion.wav')
pygame.error: mixer not initialized