Firstly, I highly recommend Dropbox for all your hosting needs.
The game is cool, but positional sounds don't account for the y position (unless i'm missing something because I don't have surround sound), so I was confused at times. Also, the nodes are way too big, and it's easy for someone to just go about scanning the playfield for them, which really defeats the purpose and difficulty of the game. Scanning the play field (ie, randomly moving around) shouldn't be a viable alternative. Other than my little criticism, it's pretty polished for a first game, and the idea is well excuted.