The intro didn't seem *that* long to me. I actually thought it was a cool intro. I guess I must not have seen any of your videos recently because I don't remember the intro being like that. But, since people nowadays have such short attention span, yes, you could consider shortening the intro perhaps. Certainly youtube does not automatically do the comment, like and subscribe at the beginning. I don't know why you say that. Consider putting that at the end of your video instead.
As for the main part, I agree with ellwd... it was hard to watch because the cube is out of view a lot of the time for starting and stopping. It's nice to see the cube close up, but not THAT close.