One suggestion: script - or at least outline - what you want to say and have it on the screen. Look at the screen, if not directly in the camera. You keep looking around, all "shifty-eyed" and I found it both annoying and I got the impression that you weren't being straight with me.
Just to offer another voice (but not to undermine Ben's feedback), I thought your video presentation was just fine and being that it is your first one, I imagine they'll only get better.
Signed up to follow it. I see what Ben means, but on the other hand you don't want a zombie like stare at the screen. I think you managed this well and certainly look more honest that most politicians.
Maybe it's the hip way to video with mood lighting, but I'd suggest turning on the lights and filming in front of a plain background or a designed set.