Twelfth Annual FMS Scarelicious October Movie Series: #2 Await Further Instructions

This one came from an AV Club "best horror movies to stream on Netflix" list.  I may have to rethink going to the AV Club for streaming horror movie recommendations.  Also: this is a Christmas horror movie.  I've never really thought about it but perhaps I should do a deep dive into the Christmas horror genre: Black Christmas, Krampus, Better Watch Out, Silent Night Deadly Night, etc.  Something to think about when I'm at a loss for something to watch.

Anyway.  Await Further Instructions is a low budget, bottle episode of a weird little movie.  It is not scary but definitely tries to crank up the tension and foreboding.  Nick has brought his girlfriend Annji to his estranged family for Christmas; his mum is thrilled to see him but his dad didn't even know he was coming.  Tension ratchets quickly as Grandpa makes racist comments (Annji is of Southeast Asian descent) and Nick's pregnant and ignorant sister and her bro husband show up.  Nick promises Annji that they'll get up early and leave before anyone else is awake.  When they get up, however, the house has been completely covered by a metallic substance and there is no way out.  There's no telephone, no internet and the television is flashing ominious messages like: AWAIT FURTHER INSTRUCTIONS.  YOUR FOOD AND WATER IS CONTAMINATED.  ISOLATE THE INFECTED PERSON.  INJECT YOURSELVES WITH THE VACCINES - this last, when a packet of previously-used hypodermic needles is dropped down the chimney.

Dad is all in with obeying the messages.  Nick and Angie resist for a while but before too long, Angie (sniffling with a head cold) is locked in a room; Grandpa is dead; sister's husband has lost all the fingers on one hand for trying to poke at the weird metal covering the windows.  It gets worse: everyone starts to lose their shit from the stress, and towards the end, with only a couple people left alive, it gets weird.  Like, low rent Cronenburg weird as the metallic cables become sentient and snake their way through the embattled house, reanimating corpses and the like.

I like weird.  I do.  But I like to know why things are weird and Await Further Instructions is just not forthcoming.  Is it an alien invasion?  (That's my assumption.)  Is it some government science experiment gone horribly wrong?  Is it the rise of the machines?  I'll go along with pretty much anything - but let me know why.