For me the game worked perfectly without any interruption, and unlike others, I didn't encounter a single bug. I didn't have problem with the auto save either, although since the game is still quite short, you don't really have to worry about the saving.
The apartment where the story takes place is quite cozy and decorative, but of course if this could be still improved, I wouldn't mind. And this "upcoming" NTR is also a large motivation for me, and I hope they won't take it out from the game just because a few people swore against the genre on this forum.
What actually bothered me was rather the so-called passivity which characterized the whole game. Our mistress in the apartment is as static as a statue. She just sits or stands in one place all the time, and completely motionless. I'm not saying she should cook or take out the trash, but she should definitely show some activity.
The same applies to the animations, all of them are passive and short and too simple compared to other games. It's no longer enough if the porn animations consist of only a few movements that are repeating. This makes the game pretty anemic.. The biggest emphasis should be definitely placed on improving this.
In addition I missing the free camera option as well during these scenes, but I think it's only a matter of time and they will add it.
And one more thing. A day should be more meaningful than just playing with the mistress for a few mins, and after we go to sleep. This will be a bit monotonous in the long run if only these two activity will alternate each other. I hope the devs already have some plan to make this game a bit more viable.
Overall it's a promising game, and has enough potential to be a favorite of many one day.