This is a hard one to give a score to.
Because it has great qualities, for exemple the girl is hot, the renders are good, the animations are smooth as well, the author didn't make the mistake of being too ambitious of making crazy movements that end up appearing unatural. No it's small movements, with a smooth and well done animation. And the scenes are well presented generally.
I do want to play it more to see the dirty things will do with the main girl.
But then there are all the bad points and the weird grating stuff.
Fist the english isn't good, but it's not like the usual "not good english" we can see in some of the games. The structure of the sentence is often good and the mistakes are weird. For exemple : "I will did everything which aunt "mariko" told me to do!"
When the MC tells his uncle he will help out his aunt.
There is also the fact that the author doesn't let's us save during scenes, only in roaming mode, even though it's a renpy game. Meaning we can not save at the scenes we like... So all your saves are of the same generic corridor with no way to know which scenes will follow up. That makes the saving system close to useless except to save where you stopped and there are no galeries i nthe game either.
For some reason your aunt's name is always in quotes. So when you adress her it's always : aunt "Mariko"
Just weird. Why?
So yeah, good potential, please get someone to check the dialogs, fix the saving issue. I need to save when her boobs and pussy are on the screen, not in the corridor before going to the bath (especially since I can't roll bacl to save!) and you probably have something good.