Most of romance novel I've read in my younger days always have the same step.
Phase 1 - MC meet the girls, they got close, get intimate(mean get fuck).
Phase 2 - The couple start revealing each other secret/past. Problem appear whether it's about their real character or come 3rd party like ex-lover, or family objection, or one or both already have bf/gf/husband/wife. The relationship are tested.
Phase 3 - Solving the problem, either end with good ending, like getting married, or bad ending, like getting separated. Or horror ending like one side kill the other.
For me, this game still in phase 1 & very very slightly going to phase 2. So it's feel like it's short, or matter of fact it is felt like rushed to ending. There's no phase 2, let alone phase 3. This basically just a slow burner meet & fuck game in the end, fucking them is the destination, the end of the story.
And why I (and others) felt that way, is because from the start to v0.8, this game have good chemistry and we all still thinking it's still building up the plot, only to find later, start from v0.9, the story gonna wrapping up. Only the Step-Milf get fucked and it's now down to single path route that leads to the end.
It's just sad. But your, game your rule. And more sad news for me, your next/other games are not keep it on the family theme.