Update: I forwarded this review to Alli, who I've interviewed a couple of times in the past. From his reply:
Each film I make always carries a deeper subtext -- "what this film is really about" -- that I don't tell the actors or the audience. It's part of what drives me to make each film. With "Forest" I wanted to offer an aesthetically pleasing yet psychologically disturbing experience of getting lost...lost in the dark wood, as it 'twere.