I just finished playing this and I really enjoyed the alien daughter ending. I liked how the MC holds her hand when they go through the portal. That was the first real affection anyone had shown her in her short life.
Was a bit disappointed there wasn't more content with the human daughters though really would have liked to seen Zoey more she was such a super cutie. I also did the ending where the MC goes back to Ingrid and luna.
I think it would be interesting to make spinoffs of this game. There could be two made one with the MC and the alien daughter back on earth which I think I would enjoy quite a bit and the other on the new planet with Ingrid/Luna and those who were on the ship. I was wondering what the daughters would think of their father since you know
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Another interesting idea would be to have the alien daughter stay with the MC on the new planet and have her father teach her to be a better person and to treat the others well and to be forgiven for what she had done after all she is actually a child still and like the MC said she just needs proper guidance and that she is his flesh and blood.