The movie's use of a time loop as a plot device also allows for a exploration of the idea of free will vs. determinism. Is Tree's fate predetermined, or does she have the power to change her circumstances?
Often described as "Groundhog Day meets Scream," the story follows a self-centered student who must relive the day of her murder repeatedly until she unmasks her killer [12, 18, 23]. Plot Summary Index Of Happy Death Day
The movie also explores the idea of mortality and the consequences of one's actions. Tree's repeated experiences of the same day serve as a reminder that every day is precious, and that our actions have consequences. The movie's use of a time loop as