Let the Nightshine In is a VN with a heavy emphasis on ntr. While there's technically a non-ntr route, it has very little content at this point. I'm not really sure why devs bother to make what is essentially two different games just to attract or dodge different fetishes since it feels like it sucks the soul right out of a game (not in a good way), but I digress.
While there's not a huge amount of content as of yet, there are some distinct grammatical/spelling issues throughout the game. While it's certainly not MTL, there were a number of moments with poor word choice and a rare time or two when I had no idea what was being said.
A second issue I had was the lighting and color choice. The game feels supersaturated, and this is coming from someone who typically doesn't pay attention to stuff like that. Everything feels uncomfortably bright. The vaporwave style font used in some scene dividers is also almost painful to read, but that may be just my opinion.
With the technical qualms out of the way, the story is adequate. It's not doing anything groundbreaking, as I've played a few sex games where the male MC fantasizes about sharing his ex-slut girlfriend and she agrees when he brings it up. I guess it's good enough to introduce the fetish, but it's nothing new.
The characters are fine, but it definitely feels like they know each other far better than we get to know them. There's been hints of a turbulent past between various characters, but nothing is ever told directly to the reader. While I don't mind a little foreshadowing or teasing, it's another thing when characters' actions are based on events and backstory the readers don't know. I'm left feeling out of the loop, not curious.
Lastly, the models are fine, but barely a step away from default honey select. I'm fairly sure I've seen the same main character in a dozen different games. I get that the guy isn't very important, but come on.
Overall, I feel like the game has some promise, but the over saturation is the real dagger. Without using some darker colors or adding some shadows, I feel like the game borders on unplayable, no matter how good the story.