Oh, man, I wish the geese had something to do with it x3 I think I remember what it is, so I'll put it below spoilers :3 Thanks so much for checking out the game and taking the time to complete the random side stuff like this <3
SPOILERS
It sounds like you pretty much did most of the steps. I know you said you listened to the audio clip, so I don't know if you will have also done this, but as far as I can remember, you need to download the audio clip and reverse it to hear the true message.
BUT... to be honest, even if you do that, it's still somewhat difficult to hear the password being spelled out >.< It's probably a pain in the butt to sit and listen to, and it makes the tiniest bit more sense if it's a word heard before in a bonus section of a couple of my other games. Just in case you wanted to try and get it yourself, I'll put it a little below.
Hoping my memory isn't betraying me here since it's a long time ago that I made this game, but I think it's:
Anathema
I can't remember if it needed to be typed exactly like that or with all caps/all lowercase or anything like that though >.<