I don't think many real "Ghost" films have been made in Malayalam. Bhargaveenilayam (1964) still remains as an example for an aesthetic portrayal of a ghost story, while Sreekrishna Parunthu (1984), Atharvam (1989) and Ananthabhadram (2005) have been attempts to tell stories surrounding sorcery in a reasonably engaging way. But other than that, the horror elements of a "ghost narrative" have mostly been used in conjunction with other tracks (predominantly, comedy) in Malayalam. Probably Vinayan is the only director who has experimented with such themes, though the results have been mostly B-grade in nature. However, Bollywood has progressed much from their horror movies of 1980s and 1990s surrounding serpent women, and have brought out some genuinely scary movies in the recent past (though they derived inspirations from Hollywood).
While Ezra cant be called as a memorable horror film, there are certain aspects of it I liked - The topmost being the way the flashback scenes were shown in a minimalistic way over a song, which I found to be touching.