The Shade

I just finished watching this film. It managed to creep the hell out of me with the intimidatingly malevolent creature though I feel like the entire two hours of build up just plummeted in the end. I understand ( I think) that it didn't have to be the most conclusive ending in the world but there was so much to be expanded on. I haven't seen a lot of discussion so I'm looking for anyone else's input toward this film.