Hello! Thank you for the very detailed feedback.
I used unity engine because i'm already familiar with the programming language it uses and Live2d, the one I used for animations works very well with it. For the dialogue backtrack option, I think it's very possible to implement and i'll be looking for ways to do it. I'm very sorry for your lost save, if you could provide details on how it happened I can find ways so it will never happen again.
For the art, I know my art is still very amateurish. It's actually one of the reasons why I started making this game as well. It urges me to keep challenging myself and try out new things, so it pretty much pushes me out of my comfort zone for every art I do for this game.
The portrait for the dialogue was actually made last year, and the handjob scene might even be a few months older than that. I think I made great progress so far but i'm still not really that satisfied with my current level so i'm constantly practicing so I can make the characters more erotic in the future. I've actually been thinking about redoing the dialogue portrait but held off against it for now because I wanted to focus on adding more content into the game.
In the handjob scene in this page's current version(0.1), there's actually an issue with the tutorial not showing when you pressed the question mark button on the top right of the scene. It's already fixed on the 0.2 version which would be out this month. I did include an image for that tutorial in the download files but i'm currently cooking up ways to make things clearer for future updates.
For your fourth point, the goal I have for this game(and for future games) is for the simulation part to complement the joi scenes and vice-versa. The plan is when you progress in the simulation part, like Interacting with the heroine, earning money, unlocking new stuff, etc. Should allow the player to have a variety of new things they could experience in the joi part while still making the simulation experience enjoyable.
In the 0.2 update(which honestly should've been the base release), I added the "mood" and "nutrition" mechanic which affects the H scene. Mood basically changes how the heroine treats you during the H scene(different dialogue and different sets of animations). Nutrition determines how long or short the joi part is going to be. I also added a new shop that can be unlocked after progressing in the story that allows you to buy items that you can use in the joi part to help the players survive long enough.
I do very much agree that there needs to be more interaction with the heroine, though. What kind of interaction are you specifically looking for? More daily-life interactions, or spicy stuff? Because I do plan on adding more h-scenes in the future. In the latest update(0.3) i'm currently working on, i'm making a penalty scene for when the player fails to survive the handjob scene which would replace the handjob scene, or any weekly joi scene that I plan to add in the future.
I'm also thinking of making some scenes non-joi, something you can unlock when the player progress their relationship or by meeting certain conditions, and the usual joi ones. I'm very much open for new ideas so if you have anything in mind, please do let me know.
Lastly, i'm very much surprised that you liked at least some of my writing lmao. It's one the things that i'm expecting to receive criticism along with my art, among other things. Which part of it did you like? Again, thank you very much for your in-depth feedback. I really appreciate comments like these.