Selene didn't had much time left. Her sister would potentially be dead until they are all awake and up to date what has happened.
I didn't write to criticize the writing nor to defend/excuse/blame her actions. She did what she did within her boundaries. She could still have for example only woke up the non-family ones. Even if she were to get a good comeback saving the MC or someone in his family, my MC still would be done with her romantically. The sister comes as more bratty and nicer. She's gonna need an adult to teach her about life and a masculine role model

We will see in time if anyone else catch my eye.
Im more of a single LI game guy but i still try intresting harem games if its written more "normally" where things actually build up and not a MC with girls throwing themselves at his magical fuck stick after 5 seconds of meeting him. Off course, if this game is written as a harem type game were you can geteveryone without consequences (i didnt see the tag, so im assuming no and also im suuuure the other dude will be gay, they always are not to annoy the "others" lol), then i for sure will have a second save going after everyone, as to not miss out and see all the content.
Regardless, i will still wait for each update as i enjoy stories in space settings. I can't wait to see how the new people react to all the doors being locked when they try and take the MC to the medical bay and no doors open.