I can see if I can extend the deadline until noon PST on November 1, but I'd like to end it within the next few days because we've been running this for a while and it is time for it to end.
That said, this is not a competition and there is no voting, so it doesn't really matter when you finish it. Try submitting whatever you have before the deadline and marking it as "in development" through itch! Then you can finish it or upload new builds whenever you have time.