I'm glad you really enjoyed the game! The good ending takes a bit of exploration and listening to the tapes to figure out so don't worry about your skill! Thanks for the kind words for the map, it was my first time making enviro art and map making in unreal so it was a very scary endeavor.
As for the sounds, I do agree that audio is a bit too quiet and I wish we had more time to get more sounds in there. There was car sounds (and bad drifting sounds) and sirens so I wonder if you had one of our audio bugs where the game doesn't start with all the sounds on. Even still the lack of audio is definitely felt by the team! Thanks for playing :)