Gosh, I'm confused! What does it mean to listen to collect orbs? What am I listening for? How do I tell when I've collected one? What exactly can I interact with by clicking on it? Where is this door that I can go through? I just floated around and couldn't do anything.
(Don't worry, I'm not gonna rate it based on my confusion. If you explain how it works a little more I'll give it another go.)