Don’t know if you changed something on your end or maybe the google servers where just slow with some certificates in the background.
But now the google play store showed me the app like normal and I was able to download it on my Lenovo Legion y900 13.
But non the less, thank you a lot for your quick replies and help. 
Happy to have Nomad sculpt back and running, cause it is really one of the best apps for sculpting on the go, so far. Thanks for all the hard work and making that app.
It looks like, that the google play servers are a bit slow with completely certify a new device.