M. Night Shyamalans 2002 Signs movie explores the themes of faith and family through the lens of inner and outer demons manifesting as aliens. However, one theory suggests the creatures might not be aliens at all. Audiences have often criticized the movie for its nonsensical plot twists: Why would an advanced alien race destroyed by water come to a planet composed almost entirely of water? and Why do the aliens not seem to be able to open doors? What if theres a deeper meaning behind these choices?
https://screenrant.com/signs-movie-theory-creatures-not-aliens/