Could be just on my end but here's a few bugs I've noticed.
Character creation: When you hit the arrow key once you're finished, if it does not go immediately to the game take a double take at your naming choices. I had where more than once where it quasi-turned off the "shared family name" option for step mom/sister and gave them a random family name instead.
Step-sister: she gets semi-permalocked in her room. She doesn't come to living room when her line "I hear neighbor's voice so I'm leaving", you can't get the option to watch TV with her anymore on day 1 you have to choose this option through neighbor. She does go to school properly and is in living room after 18:00, any other time she is in her room. If you small talk her enough in the morning she'll repeat the neighbor's voice line and you'll leave the room but she'll remain inside. This makes watching T.V. together scene on the weekend impossible to get.
Helping study: This still triggers even on weekends.
Neighbor: Her chatting topics don't really recover the way said. instead of one hour, I have to not talk to her for an entire day before she talks again (this is both me bringing up topics and her asking me stuff).
Concerns:
Step-mom: Because she doesn't get tired of touching and the love increases every time, you can get her to 100% love in a very short span of time.
Helping study: The stat increase seems broken. I was gaining 12.0+ intimacy and love per time, per character. It seems to scale with intelligence? But like step-mom's touch, it allows to speed run intimacy/love if you focus INT.
Class Pres: Just to check the full impact of your beginning choices, I made a Intimate/Hentai character. And oh wow, the class pres becomes amazingly hard to build intimacy with because of it even with high INT. I think that's perfect but others may not.