(SPOILER)
The alternate “happy for now” ending can be found By playing Kol’s route and then avoiding intimacy with him (don’t kiss him and don’t shower with him). When Nasir confronts you in the galley, you’ll have a choice menu that will lead to two of the endings or continue on with Kol’s ending. One of them is a bad ending and the other is this new one
The Slave ending is a bad ending that happens in chapter one if you are passive with the pirate choices and the don’t run out of the airlock.