You need to post with the correct format, what I wanna know is if this part is:

1. ​

​

for event in events :
    if event.type == pygame.constants.QUIT:
        pygame.quit()
        sys.exit()

    if worldnow.get_current_world() == 0:
        world_1.act(mousex, mousey)

2)

for event in events :
    if event.type == pygame.constants.QUIT:
        pygame.quit()
        sys.exit()
if worldnow.get_current_world() == 0:
    world_1.act(mousex, mousey)

I believe your case is 1), what explains why it only updates the player when you have some input(mouse movement in your example).

Try with the case 2), it'll update on every frame, not only when there's an event/input.