Thank you so much! That really means a lot, and I'm so glad that you enjoyed playing the game :) Especially the audio-only parts, as the idea for that came on a whim, so I'm glad it panned out and that people like it.
Ah, the two other endings are pretty close to each other. There's just one thing that you need to do differently to get one or the other. I don't want to ask specifically which one you got so as not to spoil anything here in the comments, but I'll try to vaguely get you towards the right place where the fork occurs. Very near the end of the game (on the "true" ending path rather than the default ending), you'll be asked to do something, and then be allowed to move around and do the thing you were asked to do. In one ending, you do the thing you were asked to do with an item in your inventory. In the other, you DON'T do it and simply wait it out--after a short period of time, it will continue to the last, and what I consider to be the true, ending.
Hope that helps!! Let me know if you still can't get it.