I agree, Something ambient during some of the dead silence would be nice in general. I think they made a song and added it to a couple scenes but there's still a lot of dead silence from what I noticed.
We are aware of this and are composing more music for these moments. Since we're taking the music direction very seriously we want to make sure we hit the right notes.
That being said we may look at implementing some ambient sound to some scenes as a placeholder.