Hi Mozzy,
The housing video is very impressive! 
I hope you will continue working on this project.
Sorry for the delay in response, it is entirely possible to authenticate and distribute via Steam, and that’s exactly what we are doing with Project Genom. I don’t think you can use their servers for the database, and it’s easy to use a regular hosting provider for that (or host it yourself). However, in order to use Steam authentication/distribution you need to either be Greenlit or to have a publisher (with games on Steam).