"Mid Day" compared "Eega" to "Cockroach" (2010), an Australian short film about a man who is reincarnated as a cockroach after he is accidentally killed on his wedding day. The film's secondary theme is the survival of love beyond death. Rangan has likened "Eega" to a ghost film because a dead protagonist returns to his loved ones as a troubled soul. Malini Mannath of "The New Indian Express" found the scene where the fly foils Sudeep's attempt to get close to Bindu reminiscent of one in the film "Ghost" (1990). Mayank Shekhar criticised the relationship between the lead pair, which he said advocates stalking as an accepted form of romance. Malathi Rangarajan said the antagonist took the "extreme step" of murdering the hero early in the film, in contrast with the stereotypical antagonist whose lust for the female lead has just begun and threatens the hero. Commenting on the usage of Tantrism, "The New Indian Express" Kruthi Grover found the death of the sorcerer similar to the story of Bhasmasur, a demon in Indian mythology to whom Shiva gives the power to reduce a person to ashes by touching her or his head. When Bhasmasur tries to touch Shiva's head, Vishnu assumes the form of Mohini and makes Bhasmasur touch his own head, killing him. According to Malathi Rangarajan, the film's themes of Tantrism and black magic are reminiscent of the use of the occult as a plot device in films directed by B. Vittalacharya. The soundtracks of "Eega" and "Naan Ee", each consisting of five songsone of which is a remixed version of the film's title song—were composed by M. M. Keeravani. Keeravani said because the film's theme of revenge and the protagonist (a housefly) are universal concepts, his "only challenge" was ensuring the music did not have a "distinct ethnic or regional flavour" and "appeal". He incorporated the buzzing sound made by flies into the score and exaggerated or reduced it according to a scene's emotional nature. Rajamouli approached Madhan Karky to write the lyrics for "Naan Ee" soundtrack after the release of "Enthiran" (2010), explaining the importance of each song in the film's narrative. As well as providing detailed profiles of the characters, Rajamouli enacted a few scenes, which helped Karky write the lyrics.