Although not particularly new, I love the concept, and can see myself adding this one to the list of games that I will spend time playing instead of working on the post-jam version of my own game. The UI is extremely clean for a jam game, which goes a long way considering the genre.
That said, some balancing is indeed necessary to make it an actual game. I believe I have now reached a point (with about 50 passengers) where losing has become almost impossible. Refilling your ressources at the station comes pretty much for free, and conflicting personalities can be disregarded since you can stuff everyone in the messdeck for a quick relaxation session. As you said, room size limits are a well-needed part of the mechanics.
Other features I would love to see added in are a full list of passengers, with clickable links to their respective rooms, as well as a (probably optional) time limit between turns for some more tension during decision-making.
Anyway, I'm looking forward to seeing this turn into a more fleshed out project.