You might want to work on the audio. It's only in my right ear right off the bad. Don't use a stereo organization for the audio; I listen to videos with headphones, so only hearing in one ear, then the other is very annoying. You should also work on the audio clarity. You aren't nearly loud enough, and the breathing can be heard, much to my annoyance. Maybe you should get a new, better mic. Finally, have a more dynamic opening. There's nothing there, and you need to grab the attention of your audience. YouTube says most viewers click away within the first 15 seconds, and considering you have a 20 minute video, you should really have a dynamic opening, to make them want to stick around for the whole thing.