Please,
please,
please understand that what you have done is absolutely amazing. Completely above and beyond. Totally high quality and stunning. Following the feel of Cloverfield, [REC], etc.
You asked for feedback, so I'm offering some. I mean no offense.
The video is so well done, I think the letter should match. I think it should have a more ominous tone, that's all.
Of course, all of this makes the little two-tone invitations I print out at work look like total crap -- so that's a lot for that!