Is there any opportunity to re-submit a fixed game past the deadline if the particular bug is a simple fix yet has rendered the game absolutely unplayable?
I was wondering the same thing. I had a final build ready before the jam but just when I was going to submit the file somehow got destroyed and Unity broke all of my scripts. I managed to recover the file and was really hoping to update the game, but it seems like the jam doesn't allow that.
I messaged Reece and he said he would be on later tonight/tomorrow to help people with resubmissions. You should send him a direct message on Discord. ReeceGeofroy#5090