Unaru presents a compelling story that is both socially relevant and emotionally engaging. The screenplay is crafted with attention to detail, allowing the characters to develop organically and the plot to progress at a measured pace. The first half effectively sets up the narrative, introducing the key players and their motivations, while the second half intensifies the drama, leading to a satisfying resolution.

The pacing is steady, though some sequences in the middle may feel slightly drawn out, the overall flow maintains audience interest. The songs composed by Ilaiyaraaja blend seamlessly with the narrative, enhancing the emotional undertones without disrupting the story's momentum. The background score is subtle yet impactful, complementing the film’s mood and elevating key moments.

Cinematography by K. Ramachandra Babu captures the essence of the setting with a naturalistic style, adding to the film’s immersive quality. Mani Ratnam’s direction showcases his early ability to handle complex narratives with sensitivity and nuance, making Unaru a noteworthy entry in Malayalam cinema of the 1980s.

Mohanlal: Delivering a nuanced and convincing portrayal, Mohanlal brings depth and authenticity to his character, anchoring the film emotionally.

Sukumaran: Sukumaran provides a strong and steady performance, effectively complementing the lead and adding gravitas to the narrative.

Ratheesh: Ratheesh's role adds complexity to the story, and his performance is marked by intensity and conviction.

Sabitha Anand: Sabitha Anand delivers a heartfelt and sincere performance, contributing significantly to the emotional core of the film.