Hey! I really really like the concept of this game, and love your sound design! Very evocative, and works with the restrictive gameplay.
Though I love the concept, I struggled with a real sense of repetition with "tree" being what I echolocated 98% of the time and "trap" being the only other thing I ever located. The game just also feels unresponsive, which I get is part of the design, but it's just too much of a wait for feedback from your echolocations. I love the idea of a game about blindly moving around with very limited info, but I would need more info to stay engaged, more kinds of objects in the world and more of a goal. Even a very simple limited goal that doesn't give away the larger story, like finding and using an object in each area, would be really helpful.
Very cool!