Buldermanden

The previous comment was insightful, and I would like just to add that this film not only has a suspenseful atmosphere, it's also exploring emotions of guilt in a child, and it contains a lot of humour.

The comparison with Hitchcock doesn't work for the comic element of this movie, it's more in line with Tove Jansson's books or Franz Kafka. I would, however, halt the Kafka comparisons there, although a child's perception of her surroundings may be similar sometimes to the feeling of alienation that is often experienced by readers of Kafka.

The use of sound in this film contributes to the overall atmosphere, and draws on further inspirations than Hitchcock.

I was more than 30 when I saw it, and it made me feel (indeed: feel) like a child.