Very good, though...
Spoilers. Watch before reading.
The ending felt like a waste to me. The whole piece has excellent animation, great art, and very good use of sound. Each shot felt important and you put together a great story with barely any dialogue, rellying on atmosphere and explressions to tell the tale.
However, the first problem for me came near the end, I think him finding King dead alone would've been enough, and the gore on display was unnecessary. The other problem is the reveal being a cheap joke. And while that may have been the point, I didn't like it as an ending, and would have prefered them remain in mystery.
That said I really like this, it's almost perfect, and would love to see more horror like this from big budget productions, rather than the slasher movies we get today. Thank you for making a great piece of animation. :)