I'm a bit unsure about this rule:

Everything required to make the source work should be available publicly. If 3rd party libraries and tools are required, free or paid, that’s fine. If you’re using an internal library, to participate in the Compo, you will be required to share it.

I was planning on using my own Unity tool. (this one) For other people that would be fine since it would be a 3rd party thingy, but I guess for me it would be an internal library. It's publicly available, but in the case of an internal library, I'm unsure if that means that it needs to be open source/free or if it's okay that it's paid.

Any thoughts on this?