Hello,
There is no full public version. The public demo is a way to enjoy the main story and almost all the content (exluding bonus scenes and some QoL) for free, but several versions behind the full version available on Patreon.
Sadly germany has a weird situation for buying nearly any of these games, which is why I'm still trying to figure out if that means, That we will have a beginning and an end for what is free content I suppose.
I'm exremely picky wich game I try buying since I heard my test might end with paypal blocking my account no matter being an adult.