Since there is no widely known Malayalam movie titled exactly "Ogo," it is highly likely you are referring to the 2019 survival thriller "Helen" (which is famous for a plot point involving a character named Ogo), or perhaps the 2023 film "Ole Ole" (due to title similarity).
The background score by Johnson is a character in itself. The recurring flute motif when Ogo appears is not eerie; it is profoundly sad. The songs, particularly "Ogo... Ogo..." (lyrics by O.N.V. Kurup), are lullabies from the grave. They don’t advance the plot; they deepen the mood. Malayalam Movie Ogo
There is no major Malayalam film titled "Ogo." It is highly likely you are referring to 0gomovies, a popular streaming site often used to watch Malayalam cinema (also known as Mollywood). Since there is no widely known Malayalam movie
In an industry famous for anti-heroes (think Aavesham, Jailer), Ogo gave us a classic, irredeemable monster. Film companion reviews hailed the antagonist as "the scariest creation in Mollywood since Bhoothakalam." The recurring flute motif when Ogo appears is