Pretty cool game. I can see how this would lead to an addiction-fueled consumption of time!
H O W E V E R
It appears this demo is another one of those 'steam wishlist' games, for when the commercial game is out, there won't be upload any full seperate version for purchase here on itch.
The game has been on steam since June 9th, 2022. There's no chance of it being available. Not everyone wants (or is able) to use Steam; but also, developers quite resonably don't want users having access to source code to something that should earn them money. Something Steam's DRM protects.
Hopefully the developer might decide to eventually upload a full (paid) version to itch if sales on Steam taper off.
Thanks for reading.