So, you’re incorporated in Australia, and the seller agreement says its governed by the laws of NSW.
I assume that Australian (rather than US) copyright law applies?
(This has implications for use of public domain IP; the US has a legacy fixed-term system, while Australia operates on 70 years after death, and its very easy for something to be public domain in one and still protected in the other. Which is a potential opportunity for non-US designers to write things which would not be able to be sold on US platforms)