Well, if this is meant to be a set, I don't see much relationship between the envelope and the business card. So I will look at them separately, then.
That said, I LOVE the technique on the card! A tad bit time consuming to do by hand, though. Would be very cool to do a laser die-cit, but I understand cost restraints. (I'm guessing this is a personal self-promotion item?) The kerning on the smaller white type seems awfully tight, but that might just be because I can't see it up close.
The envelope also is quite dynamic in a very different way than the card. While the card is subtle, the envelope is energetic. Nice added touch to have a message on the inside... BUT usually when you open a piece of mail, don't you run a blade through the edge? The recipient might never see your message, as they wouldn't necessarily open the flap that way.