Reviewing v1.0 so this will be on the more generous side since this is more a demo in its current state than anything:
Art: 3/5 stars
It's decent. The animations aren't the worst. But they're definitely awkward in places. It serves its purpose and the models aren't bad.
Gameplay: 1/5 stars
In it's current form, it's a walking VN. Run around to the spot you need to investigate (usually clear) and watch/read/skip through the scene. Then go sleep. Could use a note of what you should do in the menu or something, particularly when all that's left is to sleep. But that's assuming it ever gets more complex than "walk to the one thing you need to investigate and investigate it. then sleep" that it currently is.
Story: 2/5
It's a super basic NTR plot of "family of super horny girls get targeted by rich fatty." With a weird "revenge" plot that seems to be "Cuck MC intervened in fatty bullying the girl back in their school days and kept him from bullying her and fatty is still big mad about it (but somehow has been living with these two women for ??? setting up an unrelated trap to fuck them without ever realizing who the daughter was??)"
English not being the dev's first language isn't helping but the core story line seems to be at best "throw in some nonsense to get to the porn/NTR". Clear plans on more but as it is, I have little hope for any writing surpassing "meh, had to write something to get to the sex I guess".
Other comments:
Reminiscence room suggests this shows all of the mom's scenes except like one...which suggests it's going to be fairly small overall. Also seems to suggest oyakodon stuff will be fairly limited despite the title card implication. Unless a good half of the daughter's scenes are actually oyakodon or the reminiscence room expands. (I suppose technically there's another mother/daughter pair outside of the two main features though? So I guess not terrible odds of a decent amount there?)
Corruption is pretty minimal. Late in the demo you learn the mom has a super high libidio she can barely control or something and it seems like the daughter probably inherited that. So expect them to fall fast and just be token resistance.
NTR aspects seem like it will just be "MC is in the same house/inn but totally oblivious and player sees more." On the one hand, I prefer when you see the actual sex scenes and not simply cuck's perspective. On the other hand, for actual fans of NTR this will probably seem like ill-omens.
Overall, it's the devs first game and you gotta start somewhere. The art is alright and I like the models. It's not trying to be a grand game. But the mechanics really need work, some kind of thing for the player to actually do/have meaning in doing other than "progress the linear story" for it to be worth playing or the writing will need some serious work to make the walking VN worth the time. I could see it reaching up to 3/5 stars in the future. Not too hopeful for more.
Suggestions for mechanics:
The premise is cuck MC is supposed to be the "night guard" who's "investigating" the disturbances/haunting in the inn. Make that mean something. Provide ways for the MC to actually complete tasks that matter. Tasks that change the outcomes/inhibit the fatty from reaching the girls. This could have a further layer of complexity where MC might need X, but that costs money. Money he doesn't have, nor does the owner/milf character. So now player can have the MC insist they need it which pressures milf to go seek the fatty for cash. (Bonus points as this opens a possible "unwittingly pushed them into corruption" route if you want to really expand the scope).
It also seemed like there was a lot more that is planned for going on outside. That's a good place for player conflict. Do X outside to reach Y or fixate on the inn and now not have Y when you need it type of thing. Would also be interesting, imo, to have things that are just distractions to cuck MC. Gets involved with a random girl/prostitute/adult venue outside the house and wastes time there.
Suggestions for writing:
I didn't read too closely, but if the skim through I did do and ESL didn't totally mislead me, this might make a lot more sense if it changes the characterizations a bit. Give a reason fatty doesn't recognize the girl. Give better motivation for his "retribution". Maybe MC was something of a flirty casanova and really bullied him. Maybe MC was also something of an outcast, but still got his kicks punching down on the bigger outcast fatty? Heck, even just making it so fatty wasn't even bullying the girl and just an awkward outcast that MC misunderstood and caused great embarrassment to the fatty by "standing up to him" would work better than what seems to be the current story. It just seems weird for the title to talk about some retribution but the story seems to imply it's just "fatty was a dick. MC resisted him. Through plot contrivance fatty and MC both live in the girl's family inn and fatty has an axe to grind with them just not letting him be a bully in the past." That's maybe accurate-ish characterization of a bully, but where's the retribution?