firstly, here are some things i saw WRONG with it.
-overly cliche eg "it was all a dream" twist.. god, this is SOOOO overused and you did not do it in any original or unique way.
-too visually dark - i had to strain my eyes in some parts to see what was going on, you need a little more light.
-i dont know, maybe it was just me, did some of the actions seem out of sync with the sound? eg the guy turned his head to look at the door again BEFORE we even hear the knocking...
now, these are what i thought you had spot on.
-the music was suitable and i genuinely felt a LITTLE tense and almost frightened in some parts due to it.
-you successfully created a tense/thriller mood.
my suggestions would be to work on the acting/actors; be a little more creative with lighting ie maintain the use of light for mood but keep in mind it can be a little bit of a strain; and next time try developing a plot that is a little less cliche and more original and unique.
"Video's a poor excuse, I know. But it helps me remember... and I need to remember... Sometimes there's so much beauty in the world I feel like I can't take it, like my heart's going to cave in."