I chose Good Luck to watch on Hotstar last night because it seemed the best of what I had not already seen, and also it was a reasonable 44m watch instead of a 2hr++ regular length film Good Luck is listed under Thriller. It is in fact a Horror genre film.
I avoid watching Horror movies especially in the evenings because ... well because they are scary and who wants scary stuff just before you sleep.
The Horror component in Good Luck is not the usual in your face type; it is ever so subtle and thereby ever so much more scary. Not surprisingly my sleep quality wasn't the best last night. I kept thinking about the plot and it became even more fearsome. In that sense, this is a very good Horror film because the horror is subtle, real, believable and could happen to anyone.
Tina Desai is superb as the quintessential Goan Catholic young woman Jenny, the rest of the cast is equally good and believable. The plot holds the interest to the end, it is quite different and the horror dawns upon you oh so subtly, even much after the movie has ended. That is the hallmark of a 'good' horror movie though believe me, I ain't going to be watching another in a long time. And certainly not at night.
