Significant Other is ridiculous in its harmless way. It alternates between indie horror tropes and mainstream horror tropes while completely ignoring its tonal inconsistency, and it has a central twist that's obvious from miles away. But how can you hate on Jake Lacy's unintentionally funny acting delivery, and Maika Monroe is always welcome in the horror genre.
Ultimately a sci-fi thriller with a human touch, Significant Other combines elements of woods, extraterrestrial and trauma, while delivering them with utmost restraint, at least for the most part. The first half of the story completely flies over my head with its banal buildup, and it's only in the second half where the story slowly goes off the trail, that it finally shines in its own unique, ridiculous manner, and it does have a cool closure that comments on mental health with force.
Overall Significant Other is a serviceable thriller that's wittily metaphorical but ultimately feels recycled and dispensable.