I mostly gave this a chance despite the obvious trailer making the not so clever message clear because I like Imogen Poots, and because I'm an open minded guy, but this movie wasn't worth watching. You can guess the plot from the ominous foreshadowing of Gemma telling her student about the birds parasitically displacing the other birds from the nest, and how nature is sometimes brutal. OK so aliens are going to do that to humans. Got it. But maybe there's a twist or more to the story.
Nope. That's it. But the sci fi plot seems to play second fiddle to the heavy handed real message that the suburbs suck and its residents' lives don't matter. All the cliches are there. The alien prison realm the couple get trapped in has ridiculously identical houses. The "baby" they're given and told to raise deepens their imprisonment and diminishes their lives. The man's "job" of obsessively digging a hole in the front lawn in the vague hope it will lead somewhere just turns out, of course, to be his own grave, and that of others who came before him. Just like middle class American or British suburban men who spend decades slaving away at pointless jobs, neglecting their families, only to retire and die.
Because only Hollywood careers and maybe those of other "artists" matter, you see, not whatever those boring dudes in the rest of society spend their lives doing. The writer also apparently hates the nuclear family and can't imagine why anyone would get fulfillment out of raising kids.
Most of these idiots know little or nothing about the suburbs. In real life suburban houses have more individuality than urban apartments do. They're usually each a different shape. If you want monotony the aliens should have made them like New York City apartments, which look the same from the outside at least. The windows all alike. The doors all the same in the hallways, with only the numbers to tell them apart. Plus in the suburbs you own your own home instead of renting it from someone else.
There was no hint of spirituality or religion, btw, which probably unwittingly reflects the writer's own spiritual emptiness, the reason for his shallow worldview, his lack of human empathy or depth of understanding, and why he makes crap like this movie.