Yeah, I definitely think I should. Ill make sure to do it after the jam ends but am unsure if I can do it now since the submission period has ended. Also just checked out your game. and your pixelized art is great!
Yes you can add right now . there is a rule in Rule/Faq section on the first page of jam, you can check it.
And I didn't designed all that art bro, it is too difficult for me to design now, i used those art from gdevlop asset store