Aww, this was a fun throwback! You were only missing one convention from the old days: just entering look or examine by themselves should give you your surroundings and exits again.
I don't know if you needed the audio either. I think in the end it added a false sense of crime drama tension that ultimately made me more anxious than helped set the scene.
I think your layout was great: the big north-south spine was easy to tease out, and you kept yourself to a nice shallow, easy to understand structure hanging off of that. The writing was nice and flowed well from scene to scene. I bet it was tough finding all the different unique keywords for scraps of paper :)
Unfortunately I couldn't finish the game. At one point after visiting every room and doubling back to work out the rest of the code, the interpreter locked up: any lines I typed just vanished with no response. I'm curious enough to try again at some point though!
Overall, well done!