Oh no! That's rough.
We don't let people do bug fixes after the jam ends, but we'll work something out. Do you have a copy of the game as you submitted it?
The only way to re-upload it is to remove it and we can help you upload again, which will clear your ratings. Don't worry too much about a few bugs, it's game jam and we know how hard it can be.
This will clear all of your current ratings though, just so you know. But I think that's the best solution, if you have the git backup of the submission.
~Jade