Can I use pre-existing art/audio/code/ideas? and could I use pre-existing projects cause I have a game I barely started and I wanted to know if it would be okay if I continued the project for this jam. When I say barely started, I mean I opened, unity punched in like, three lines of code and moved on to something else.

I was wondering the same thing! I am new, and I really wish someone could answer this question.