Oh, no... this is really strange :/
The darkness parts are programmed to be random. There is no "set path," and instead, the path is different every time you play. Once you've taken enough correct steps, the event will conclude successfully. Can you still click the left, right, or up buttons even after the sound disappears? If you keep trying to click buttons, will you eventually get some new text? Do you eventually ever get to a game over screen? A few people have reported something like this happening, but then other people have absolutely no problems getting through this part, so I'm not sure what the underlying cause could be. Maybe let me know what OS you're using, as well? (And what version of the game?) I can try to start seeing if there's a connecting factor between people for whom this is happening).