[SPOILERS FOR EPISODE 5]
I never typically write any reviews for this type of game, but up until episode 5 I believed I was just playing your typical, run-of-the-mill hentai visual novel. I can clearly see this is no longer the case. As cliché it may seem, I cried my eyes out when I read through Emma's backstory. I played many visual novels, indie or otherwise, and can kind of see through the tropes as they start to unravel, but even though I can see the story beats coming they still land exactly where they needed to be. It wasn't too long, nor too short, and it didn't feel totally insignificant to the present plot going forward as a lot of these "flashback" type of storytelling goes. There are elements I noticed you may have borrowed, such as the letters from her mother being taken Episode 10 of Violet Evergarden didn't seem forced and becoming a cheap gimmick to drive her character and fit just right to elevate the emotional weight of the story being told, which I have to say is more than I expected from an indie developer. I can clearly see the passion that the developer/writer has for fleshing out their characters and making them a lot more believable and human instead of forgettable fap material.
TL;DR: Kudos to you, NiiChan, for making me audibly sob to a hentai game.