Thank you for your answer!
> The rule is mostly directed at writing any gameplay related code
We have absolutely no clue what we will be creating at this time, we will make it completely dependent on the theme. :)
> If you've already built that before you can even copy it across from an older project.
Not sure yet if i'm going to try out a newer version for this jam. And i got not much to bring into here anyways :D In the past i've mostly done some prototyping etc, nothing worth "porting" unfortunately. But importing stuff in unity like their input system, camera etc can only be done sequentially (without copying older projects, writing package files by hand, import scripts etc), so this is nice to do some time later already.
Another thing just came to my mind, which i can't find anything about in the rules. Is it required to have the source online, in our case our GitHub repo? If so, is it enough if there's just my code included, or do the source assets like animations and audio from other team members also have to be included? Or how are you making sure in general that teams won't "cheat"?