i'm putting this at 3 stars right now since it has potential but can be better, also 0.1 leaves a lot to be desired, Ingrish is really really terrible, needs proof-reader to turn it into actual english sentences aswell as change grammar, there are a few sexy scenes, but nothing truely worthwhile, more just teases of whats to come.
theres also apparently a variety of girls, first its your two nieces (or possibly daughters, since i can see that twist being a possibility,) your daughter, your wife, both your sisters, your mother and your aunt, and your cousin, anything more isn't really hinted at in the current build (0.1), so we'll have to wait for later builds to see.
anyways i highly reccomend the author get someone to do proof reading, i also reccomend they improve the UI a bit aswell, keep the regular Renpy menu so you can instantly switch to loading from the save menu, since having an entirely seperate special menu in the right hand corner where its the only way to load stuff from is a bit of a pain in the ass, there should be minimal effort in moving around to different places in the story, but overall you're on a good track.
you might just want to allow clarification for ages (if you've got the patch) and maybe allow name changes since some of the names are honestly too unique that they kind of mix with each other and i forget who exactly you're talking about, you should probably also increase focus on the girls when you first meet them in the story, since the second niece basically got flat-out ignored right after her character introduction and its only the other niece that goes with your daughter to her room when it should've been the both of them or something, you can take girls out whenever you want after the "intro"/prologue into the story, but they should all get atleast one sexy scene before the start of the second day, the mother/aunt/cousin/other sister should each get their own sexy scene aswell when they get introduced later on