Let's start by saying that I don't generally like RPGM games. Mainly, this is because of their small resolution, clunky gameplay, and the combination of backtracking and grinding, which becomes unbearable.
Fortunately, this game is not one of those, and I hope it stays that way. I can count on the fingers of one hand the number of games that I would consider modern-looking and built on the RPGM engine, and this is one of them.
I really like the art and character design. All the female characters look pretty unique, except maybe the teacher.
One recommendation I have is to add a time of day to the hints. It can become tedious to constantly travel between the quest location and your bed. You could argue that it will be obvious from the dialogue, but what about people who skim through it, somehow miss it, or simply save and come back another day to play the game when they don't remember much?
Overall, I really like the game. There aren't many decent NTR games out there, so my standards for them are much lower than for harem ones. However, I believe this game is of generally high quality. It's better to build a good foundation and then add content rather than rushing to create scenes as soon as possible and having an outdated RPGM engine version in 640x480, which makes the game unplayable (yeah, I'm looking at you, Nymphomania Priestess).