How was your experience with getting listed on Steam, and integrating their API into your code? Are you using something like Unreal Engine for the interface?
Nanome was originally built on Unity. I can't speak to the experience with Steam from a dev perspective, but we did upload our original product to early access almost 3 years ago. The software has an entirely new codebase today. Submissions to other stores like Oculus were much more strenuous and heavily audited.