I can't really say much about the game when the other person already wrote practically everything I thought. What I can say is that soundtrack is quite lovely and the whole idea of the game is awesome! idk how much time you spent coding and trying to make it work, but it worked wonderfully.
as for echo location, yeah, it's a bit rough. i used headphones while playing and sometimes barely understood where to go, but that might be a problem on my end.
wish you luck with this project and whatever you decide to create next /ᐠ .ᆺ. ᐟ\ノ