There is a concept that to inherit the legacy of a successful movie and make a second part of the movie and call it a sequel or prequel. Usually, it is very difficult to make a good second movie because the new ideas have been seen before and probably the main characters are repeated as well. If you have a movie with a lot of material to talk about (Godfather 2) or the sequel is very long way from the original so you can introduce new materials (terminator 2), you may repeat the success. If you make the later parts of the movie very near the time of original, eventually, they will just look all the same such as Saw series. However, it is OK if you are a fan and people will follow whatever the story it was linking from before.
There are some really bad sequel movies like 'the return of living dead' movies; the series has no linkage whatsoever but it does not matter. Every movie has different theme and they were all low budget movie anyway, nobody really cares about them. I would say they are failures but not extremely bad cases.
Now, to the main topic, Gosa 2 is a movie with absolute no linkage to its predecessor. They both have about the same cast of characters just with the name changed. Several new ways of killing people but they are all similar. It is about murdering, revenge and supernatural, which is exactly the same tone as the first movie. Even the main actress, they again have chosen a singer/actress to take the leading role. I never understand why they do that. There are zero new surprising elements, zero new ideas, and even the characters are non-interesting. OK yeah, I was praising in the first movie, they had a pure school girl for a change, which is a fresher from watching models all the time in Western horror movies, now they added a model who is not even nude (just in swimming suit and got killed after couple scenes) in a brutal killing movie.
If you have not watch Gosa 1, I guess you may find this movie interesting. If you watch either one of them, don't watch another one. They are just the same movie repeated with different actors.
6 stars if you have not watch Gosa 1, 2 stars if you did. Average 4 stars.