I would say this first release is fairly mid. I wouldn't say bad, but it's obvious this is another ESL dev who learned the basics of using Daz and decided to make a VN.
First off, I like the use of hypnosis in the story. It's not outright mind control, but I was given at least something of an induction and the vague hint of actual hypnosis rather than just using special mind control powers, so I appreciate that. That this dev isn't actually a great writer is where that part falls short.
So far, the story is similar to many other incest games. The art is ok, although there's often an issue where the girls look completely expressionless. The younger sister looks too young for my taste. I'm really not into loli, so I would advise the dev to make her look a bit older in the future. The older sister and the mom are fine. The MC looks like every other generic 18 year old MC. As an aside, and this doesn't really impact my rating of the game, but it's increasingly hard for me to identify with these young MCs who really are exactly half my age. Maybe that's why I'm crankier and less easy to please, I dunno.
Overall, this is a very average game that's at least comprehensible, but it's not going to blow anyone away. I'll keep playing it for now, but there definitely need to be some improvements.