Hi, and thanks for the questions.
- Mia is planned to have a unique ending and likely a relationship option as well. Not too sure about the other three, since it depends on how many chapters are left, but I do plan to at least have a harem ending where Rita gets all the girls and/or boys.
- Yes, there will be unique dialogue for the different love interests if Rita chooses to date several of them.
- Pregnancy will likely be added as part of the endings, which can be enabled by choosing not to take birth control after a certain point.
- Sara and Lucy will both get more scenes, including sex scenes.
- Sure, I can add back the option to delete saves in the next update.