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!

Pretty fun! A tutorial would be nice because it's a bit unclear what to do. A reset button would also be nice so you don't have to reload the page when you die. It has some horror elements but is not very scary