Basic virtue - the relation between two brothers , admirable reflected in fair nuances. One, the younger, ill and imaginative, the other, the older one, potecting him with some dose of skeptikism about his stories about a presence in house.
Beautiful photography, wise crafted story.
And the simplicity as precise tool for define the main characters, for sustain the tension , for offer the answer, not exactly expecting one, more realistic but, in same measure, more thrilling.
Because it offers the feel of a parable, reflecting the menace of a well defined relation and the differences between two young men.
The end is just correct, offering a special feeling to viewer.
In short, profound beautiful old fashion short horror.