This movie feels like it's been edited to the bone - there are a bunch of unrelated story elements which pop up throughout, yet go nowhere, and instead of complementing the plot, they just muddy the waters and make the story confusing. Some characters are introduced with apparently important information to reveal, but with absolutely no context as to how they know what they do, or why other characters should even listen to them. Characters affected by the mimic can experience various physical responses, one of which seems quite dire, but the experience just ends as if incomplete and leaves you wondering what happened to the character afterwards.
The most definitive element of the film is the acting of the young girl playing the mimic. She's hard not to like, making the viewer's response conflicting with the scenes that follow, and engaging you to wonder what she will do next. Unfortunately though, the constant plot holes and character actions which simply don't make sense detract from this being anything other than a forgettable horror flick.