The rules i know are:
- you must be on discord of the jam creator or atleast one member of your group should be (i think)
- The game must be made on unity
- No using paid assets (try to use your own if you can)
- Like every jam the idea is to do the game on the short period of time, so no projects that you finished before jam time
That are the jam rules if i am not wrong.
The jam is made by the brazillian youtuber "André Young", here is his youtube channel link:
https://www.youtube.com/c/AmdréYoung
Hope it help! ^^