From where you got the impression this is 90% completed? The 0.9 is just arbitrary version numbering. This is like 20% completed with multiple untied ends and endless new characters being introduced. Some girls get content update two years ago and is never touched on again. And the dev is famous for disappearing months in a row then announce fake release date to lure people into paying money, only to ghost on his patreon for weeks before giving them a buggy 10 mins update every 8 to 10 months. So abandoned tag goes to this scammy milker, well deserved.
whether or not any given dev follows the vers coventions, NORMAL programming convention is vers.01 for an initial "proof of concept" type release. Then .X for major updates, generally understood by default to be in approx 10% increments toward project completion. A game vers .53 for ex, would indicate approx 1/2 completed with 3 minor updates/bugfixes applied. Vers 1.0, indicates a completed project; possibly pending bug fixes, but intended content is done.
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