I tried several times getting past the intro, but unfortunately haven't been able to. Following the man by his voice is quite hard when he only speaks every ten seconds, and there is no real sense of progress.
So I haven't played the echolocation part! Which apparently seems to be the core or the game? It looks nice but, well, I just couldn't get there.
I don't think I'm the only one stuck at the beginning. I see how the intro is interesting (asking players to use only their hearing to navigate, yeah that's a cool idea actually), but practically it works just as a wall here. Nothing that can't be fixed, but in the meanwhile maybe it could at least be possible give hints/instructions in the page's description so that players know where to go?