Will this version become public at any time?
Dunno, but it sucks when devs paywall this much stuff this early into development. The demo is just doing the same scene 99999999 times with one girl to grind money so you can do the same scene 99999999 more times with the same girl but bigger, which isn't really fun at all, especially since the gameplay prevents you from actually watching her grow, and the gallery is paywalled too.
Devs really gotta wait a bit more before paywalling things, at least it's not like some games where they paywall bugfix updates and there can be entire weeks of time where the free version is literally unplayable due to a bug.