The film's soundtrack and score were composed by , who created one of his most underrated and spiritually resonant albums. Songs like "Moongil Thottam," "Naanthana," and "Adiye" are noted for their haunting melodies and complex orchestration, blending Indian classical, folk, and Western choral elements.

Kadal is not a typical mainstream movie. It is a slow, meditative, and visually stunning allegory about the nature of good and evil, the possibility of grace, and the power of forgiveness. While it may not appeal to viewers seeking conventional entertainment, it remains a significant work for those interested in cinema that dares to ask profound spiritual questions.

Upon release, Kadal received polarized reviews. Critics praised its ambitious themes, breathtaking visuals, and Rahman’s music, but many found the narrative uneven and the pacing slow. The film was also criticized for its heavy-handed symbolism and a script that some felt did not fully realize its philosophical potential.