There is no rule that would limit you to just the contents of the package.
I thought that was what the rules originally stated, and I still think that's a better rule, since it all puts us on an equal footing. You have to do your best with what you have, creativity only will serve as judgement.
Saying "anything goes" makes it sort of pointless/
I don't think that was the point at all.
The way I see it, GOG wanted us to be creative, without limiting our vision. They gave us some footage as a good starting point to turn that vision into a real video, but that should not limit us in creating our idea.