Hey, I had a critique: I don't recommend allowing the player to set the relationships for characters without really specific information because we don't know who these people will be in your storyline later.
Just saying that someone is "really special to you" isn't enough for determining who they are in relation to the main character. I don't know if they will have dialog later explicitly describing their relationship together or not. I don't know their ages compared to the main character, I don't even know if I live with them or if they are strangers in the intro to the game.
I started reading the actual plot parts of the game and then realized that all my prior choices were wrong because I didn't have any context. Now the dialog is confusing because it turns out that I was naming my parents. I hope I explained this properly. I basically had to restart the game by scrolling back and redoing all of it.
If you have a certain idea in mind like family-related content or something, put that as the default and then have the player decide if they don't like that or not. Then they can change it to their own preference (like renaming mom to landlord, sisters as other tenants, etc. This is similar to how other games handle it).
Anyways, sorry for throwing some criticism at you right away. I'm liking the overall product so far. It's writing can be a bit clumsy here and there, but it's forgivable since it's your first project.
Also, just curious, what 3D program or assets are you using for your scenes?
Thanks I appreciate any kind of genuine criticisms, I apologize for the confusion with the relationship labeling. I will do my best to address this in the next update.
edit- I use Daz 3d studio
edit2- The M.C was kidnapped at the same time the twins were born, so they are both 18. Saeko is only year younger then the M.C. I assure you all characters will never be underage (All of the current female character are all 18 or above), and if any do pop up I will give notice they are underage and they will not have any adult content.