Naanayam delivers an engaging storyline that combines elements of a heist thriller with emotional drama. The screenplay maintains a steady pace, especially in the first half, where the setup and character motivations are clearly established. The second half intensifies with suspenseful sequences and plot twists, although some moments tend to drag, affecting the overall momentum.

The film’s music by James Vasanthan complements the narrative well, with songs that blend into the story without feeling intrusive. The background score effectively heightens tension during critical scenes, enhancing the thriller aspect. Cinematography by Om Prakash captures the urban milieu convincingly, adding to the film's gritty tone.

While the screenplay is generally tight, certain plot elements could have been explored with more depth to avoid predictability. The songs, though melodious, do not particularly stand out, serving more as narrative tools than chartbusters. Overall, Naanayam is a commendable effort in the thriller genre with solid technical work and a gripping core story.

Prasanna: Delivered a convincing and restrained performance as the protagonist, effectively portraying the character's intelligence and emotional depth.

Sibiraj: Provided a strong supporting role with a natural screen presence, adding to the film’s tension.

Ramya Raj: Played her role with sincerity, though the character had limited scope.

S. P. Balasubramaniam: Offered a memorable cameo that added charm and gravitas.