Okay, i've tried the game. Very nice idea and the uses of sound are quite unique, I particularly like the way you have a large range of frequencies to choose .
I do still have a few questions however. Firstly, whatever option I used within the game, it started the demo, even when I used instructions or about, which was a little confusing sinse I began with a speaker test to check my headphones were on right as indeed I usually do when playing an audio game. This was a slight shame because one thing I distinctly wanted to know was a little more about how the full version differed from the demo version, for instance is the demo version an example of the full version played at one difficulty level or with one soundscape? I'd actually appreciate knowing this before starting the db entry sinse in our game descriptions we do try to give people an idea of the differences betwene demo and full versions of games, and that might be rather usefull information to have.
It might also be nice to know a little more about the exact frequency your working with, particularly when it corresponds to musical notes, indeed I noticed a perfect A in there, and it could be a rather nice game for people to improve their sense of pitch and musical ear if they could be notified when they were working with a specific note, indeed if it had such a feature it could be very usefull for teaching music, as well as a challenge for everyone else.
You might also considder expanding it with some of the features that some other point styling arcade type games have used in the past, such as achievements or making higher difficulties unlocked by completing lower ones. such things aren't manditory of course, but other arcade point scoring style games have used them in the past as a way of getting people to play longer.
either way, nice game, a very unique idea, and thanks a lot for letting us know about it.
With our dreaming and singing, Ceaseless and sorrowless we! The glory about us clinging Of the glorious futures we see,
Our souls with high music ringing; O men! It must ever be
That we dwell in our dreaming and singing, A little apart from ye. (Arthur O'Shaughnessy 1873.)