I've really enjoyed this game. See, I even wrote this long ass review. Hopefully it is informative and will help with future development decisions (if ever seen). Tldr not at the end, so skim if you want.
I categorize games into 2 broad categories: those with great renders and those with great renders
and engrossing stories. This one is definitely the latter. I spent around 2 hours or so just reading and enjoying the events of the world and the characters. The developments are interesting, and while the pacing is slightly slow, it was still pleasant and enjoyable. I don't imagine many people do this when presented a harem, but I rejected all other characters and just pursued Iris- and still I didn't feel like I missed much. That's a good sign for your baseline story.
Pros:
Writing/Relationships - Overall quite good. I really like that the interactions between the characters are believable (sibling banter, animosity between ex's, etc); things that are forced aren't too egregious (bathroom peeping, universal attraction to MC). There's a good set of character archetypes to play around (earnest/class rep, casual/FB, capricious/delinquent, tsundere, popular/cheerleader, MILF, etc...) which makes things interesting. The writing is humorous and got a few sympathetic nose exhales out of me. There is not much character progression yet, but the development in the relationship between the MC and Iris is great, and the payoff is already quite satisfying. The eye-discoloration/confession part was a really memorable and clever plot device, the tension, flashback, and reactions were all expertly done, and the translation in the relationship/resolution was supremely satisfying. Definitely the best part of the story so far and I'm looking forward to how their relationship develops from this point. Hopefully we can get a true ending with Iris, start a family.... well I can hope
Animations/Renders - Also quite good. The different angles and positions are nice, the movements are usually natural and smooth, and I really appreciate the 'afterglow' animations when they are present. I think the facial expressions are great and the renders are well done.
Cons
Animations - Aversion to illustrating creampies (1 instance?) and not enough care and time allotted to climax. That's really the payoff of the scene, the peak, but its neglected. Its jarring how all of the buildup, several angles and positions, leads to a somewhat lackluster finish, and then transitions away quickly (that's why I appreciate the afterglow scenes when present). It would be vastly improved if you gave these scenes more attention. Maybe its a personal kink thing but the creampie is really underplayed here.
MC(?) - A
potential drawback is the propensity of the MC to white-knight. I find such characters unrealistic and exasperating, but that is merely unsolicited personal opinion. I say potential drawback because you hint at dark events and twists upcoming: in order for world to feel dynamic, the upstanding MC needs to grow and change, to at least feel the moral pressure in dealing with these events (potential drawback if he remains static). These dark twists will provide a great opportunity to develop the cast.
Choices - Really the only choices that exist are those which turn off or on the sexual content of the harem members. Not many meaningful story choices. Some choices really aren't even choices at all and railroad you into the same path. Having meaningful choices that alter the storyline and ending makes the game 5x better (yet 100x harder to create).
Overall, really enjoyed it. I hope development is successful and informative for the dev. Looking forward to more.