More than Sci-Fi or horror it's a story of complex relationship between father and son who is a problem child. Hakka and tribal group underlines the importance of social parenting which is disappearing now a days.
Even though it's a good movie and first of it's kind in Malayalam industry I am happy to see lot of negative reviews, may be they are unable to accept the movie as they may not have a darker side within them.
I didn't felt any lag, in Ava's horror scenes they could have used any innovative vfx other than old fashioned eye colouring and black root growth on victims face.