Naishitai is easily one of the most unique VNs that I've played, and it's clear that a lot of care went into this.
This was definitely a change of pace from most other VNs I've played due to how interactive it was - the noodle minigame of course being the standout part of this. It did get a little frustrating towards the end with how difficult it becomes, but of course that's also kind of the point. I have to wonder what it would have been like to give the player the option to continue after failing those minigames enough times to make it slightly less frustrating to play, but still get enough of the point across. Maybe with different dialogue etc depending on whether or not you succeed or fail.
Noodles aside, I loved how dynamic the scenes were. Most VNs are pretty static so having the camera/scene change every few lines made it much more interesting. Seeing Nai slowly carve out parts of herself as time goes on was pretty striking visually. Again, it's clear this was a very personal project and that you put a lot of time, effort, and thought into putting all of this together. The sound design was also extremely well done, especially for the interactive bits. I am curious though, is there any reason why you specifically chose Unity to make this as opposed to using Ren'Py or similar - was interactivity always a big part of the idea from the start?
In any case, I really hope that you continue to make more things in the future, I'm definitely interested as to what you'll come up with next.
And of course, I also hope that one day Nai is able to replace all of the parts that she's missing.