I think it would be cool if we got/get a Citizen Sleeper game that takes place IN an Essen-Arp facility.
Like, we'd start the game going through processing, reeling from the feeling of being in a Sleeper frame, and how it feels so alien yet so natural.
We'd meet other Sleepers, and get to know them as we go through our routine tasks...
Sleeper classes would play a much bigger role in the game, I think. Each class would be working in a different part of the facility, and only have access to the parts that their class would most naturally work in. Meaning that the player would need to play through the game three times, using the different classes each time, each playthrough would have a slightly different storyline and events.
I think a good ending to the game would be us escaping the facility. Maybe with the friends we've made along the way, maybe in good health or not. Depending on the choices we make and how we perform leading up to the escape, of course.