O.K. first of all I think it sounded great. But if you want my opinoin (remember you asked for constructive critisism)
I think you sound like a product of scales. I think you could get a better felling from your blues if you cocentrated more on a single note than a bunch of cotinious notes it starts to sound very repaticious. Dont get me wrong it does sound good. I think people just always seem to over play.