The tension in this experience felt really natural, which is especially cool as it wasn't created by superfluous sounds or the like. Great job on that!
That said expanding and changing the audio space would definitely add another dimension to really flesh out the experience.
Neat little experience!
[Also on a side note this game also really suits the theme of the Narrative game jam going on atm, so you might want to check it out! https://itch.io/jam/narrative-driven-jam-1]