Great list! One of my favorite genres. I would also include Starfield and TradeWars 2002.

Journey to the Savage Planet is a maybe... it mostly takes place on one planet, not in outer space. But the whole thrust of it is that you have to work off your debt to a giant horrible corp, similar to Citizen Sleeper.

Tim Curry disagrees.

The first Space Quest is about a space janitor named Roger Wilco