For all the reasons that have already been mentioned, this one was fantastic! It was so good it made me want to watch it again immediately. Bravo to everyone involved. Great usage of the time. Felt a lot longer, the lead was really good, very compelling, the twist was genius and explained the problem between the dog and facehugger.
Emotional, compelling, tense, satisfying yet still leaving me wanting more. Simple, but original. Original without going crazy with the lore. I'm so thrilled we got something like this. Smartly made.