I saw this a few months ago. You can easily swap out the monsters for rebels, terrorists, etc. They are a backdrop to the relationship to the main 2 characters. I enjoyed it, but my wife hated it. They put some thought into the monsters and probably from the lack of a significant budget kept them from showing them every other minute. That's a good thing as it plays up the creep factor.
They passed an old woman who was just opening the door of a brown Cadillac. An old man was already sitting in the passenger seat. The car had a personalized plate with the letters “J-U-S-P-R-A-Y”.
“That stuff work?” Israel said to her.
“‘Scuse me?” the little old woman said, clutching her keys.
“The spray. Does it keep them away?”
“Keep who away?” She looked confused.
“I gotcha.” Israel gave her a conspiratorial wink.
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