Played one route through to Open Doors: receipt, survey with Mara, staff proposal, straight to the sound booth, clause comparison, and keeping the personal letter private. I'm building short personal story games under P.S.Me, so this is fellow-maker feedback, not an independent recommendation.
The clearest practical consequence was Sana becoming the handover contact. The ending says that adds a job to her week and lets Celia keep her personal account private. That is more convincing than a changed adjective or a generic "they trusted you" line. I haven't compared another route, so I can't say how much the alternatives differ.
My first story stumble was Celia admitting there was no theft in "Under the work lights." I had only just started investigating the missing agreement, so the mystery felt resolved before I had much chance to form a theory. One extra clue or contradiction before that admission could make it feel earned.
The operation/access comparison was easy to follow. I'd replay to see what changes if Celia reads the letter herself, rather than just collect the other ending labels.