I really like the idea and it's a nice way to get around the graphics limitations of the jam ;) Also fits quite nicely into the theme since the player has basically lost their "vision". I think that the idea has promise and could definitely be expanded on, but is a bit rough around the edges in some places.
I personally found the reverb a little heavy on the effects; it became a bit difficult to differentiate the different terrain sounds with all of the echoes so I sometimes wasn't sure which sound was playing at a given time. I thought the voice over was really well-acted and well-recorded, but I wasn't sure if the tone was super consistent with the feel of the game. I would've expected something a bit more somber and low-key, though the narrator is very upbeat/energetic (but I tend to like more chill vibes so that's my bias showing a bit).
Broad suggestion: if dev continues, it would also be nice to have a more "reactive" level where there's not so much activity at once. I didn't feel like I was in a very "listening" mode while playing so maybe just something with less constant, more subtle sounds could help break up the pace.
Good job :)