Hello
Yes, the full game has a fair few options. Quite a few visual novels have demos with no options in , so it's not unprecedented, and there wasn't really any logical need for them to start with.
Don't forget this visual novel is a comedy/drama one, and not solely a comedic. I do mostly use the comedic aspect to keep players unaware of something that's about to happen. I also don't shy away from bad things happening to people (although not in this episode) - after all the series is about an organisation that wants to take over the world and their methods aren't always exactly ethical.
Actually, I hadn't added the comedy/drama bit in the description - bit of mistake there on my part. All added now though.
Miss Potts doesn't fear Grendel's parents per se (although she probably knows what they are capable of), but she is loyal to them. She does also likes Grendel as well (being one of a few students who "doesn't just muck around in class"). There is more detail about schooling, and Miss Potts's class in No Regrets.
Thanks for the feedback, though.