I'm not entirely sure what the question is, but I'll give some information and hope it answers the question.
The demo here on Itch.io is the free public demo (Which is content up to v0.4). All officially released free public demos are this version. The demo here will remain at v0.4 for the foreseeable future (There might be 1 update to it when the game is close to finishing development)
The game is in development past this point though. Patreon and SubscribeStar do get access to versions as the game is being developed. (The latest released versions on there is v0.8). v0.9 should be completed on August 1st.
When the game has completed development, it will be released for sale on stores like Steam (and Itch.io of course). The price is yet to be determined. (The completed game (v1.0) should be somewhere around v0.16).