I was expecting a "next year" coda myself, something to indicate that the noirish fight against the forces of the night would continue.
I really like that it was a self-contained story. I think it adds to the nihilism of the piece.
I thought the Ring Wraithesque vampire language was a suitably eerie touch. According to the credits all the vampires had names, but there was nothing in the dialogue to indicate who was who amongst them.
Also a nice touch, IMO. I like that they were alien, unknown even to the viewer.
Also thought that the vampires were stupidly, needlessly messy messy eaters.
I think the point was that they were as much animal as person.
The reference to Dracula in the beginning was a nice touch.
And answered how they got to Alaska with one couple-second image. Masterful storytelling, that.