Before I begin the actual review, I will say one thing: if you are looking for a harem game, this is more of a poly/open relationship type game (leans more into open now with the female MC). Just a warning for those who thought this would be more harem focused based on the description (which I though it would be, but it quickly turns out the male MC is just there a lot of time).
The Good:
Graphics: The graphics are good for a Koikatu games. The models are generally sexy. You can tell that the dev has good taste here.
Variety of characters: There are many different species of girls, so that is one plus for this game.
Neutral:
Sex scenes: While the sex scenes themselves are fine, many of them feel repetitive (one you see one, the others feel somewhat similar in terms of positions and general dialogue).
Amount of Content:
While there is a good chunk of content, a good portion of content is random and/or grindy (just repeat the same action to see the next action). If some of the events were not random, it would be much better.
Bad:
Story/Choices: Practically nonexistent. As far as I remember, you cannot reject any girls nor have any input into the story. The story itself is plain: it is pure eroge than anything else.
Girls: While there is a good variety in the girls in terms of species, many of the personalities are severely lacking. They may start off with some, but as soon as the male MC starts doing anything sexual with them, they just become a mindless LI that only thinks of sex after that (I know that is somewhat the point of the game, but they should not lose out on all personality due to it).
If you want an eroge type game with little character development but fast sex scenes, then you will probably like this game. If you want something with more character depth, a story, or the relationships being more focused around the MC, then this game is probably not for you.