At the very moment I am using a modular track module, but I can make my own in blender if it is not allowed

I'd like to participate with a friend of mine. Would this be OK, or is this an individual jam?

I had a cool idea and I didn't want to forget about it, so I started working on my project 3 days before the actual jam...

Does this rule mean we cannot use libraries like rot.js and rote.js ( https://github.com/rocket-boots/rote)?