Oh i found another critique worthy point, you can start repeatable h-scenes before you progress the girl's main story to that point. For example, Mina's morning Yoga events can be progressed to 'oral' and maybe further before developing the relationship to the point where that'd be ok/normal.
It's an easy fix though i think, and it's ok if you don't fix it until the end of development. Probably best if you put off fixing it until all events are in the game.
Oh yeah and a gallery for the unique h-events would be nice. I can just make a ton of saves so it's ok. Idk anything about how you'd make a gallery, so i can't give any opinion on that front. But yeah it's ok if you never make one, so don't feel pressured.