I love the Renaissance of Swedish horror, I really do. The problem is that every movie from the past years have been done in a similar way before.
Also, the killer reveals never work. This one could be seen after the first ten minutes of the film. Even the twist they tried to add was easy to foresee.
The actors did an okay job, but the smell of poorly produced tv-drama can never be washed away from Swedish productions.
The setup is good, though: a murderer stalking teenagers in an amusement park, around Halloween, non the less. The movie didn't use all of this potential, though. The haunted house could've been used more effectively.