I loved the comic by ND Stevenson. 

I loved this movie too, right up to the end, even though it was clearly its own take on the story. 90% of this movie, maybe 98% of this movie, did more or less everything I wanted. The actors, animators, and writers did a marvelous job. Then, at the very end, the movie really frustrated me.

I can’t meaningfully talk about this movie, and how I feel about it, without spoiling the end. Suffice to say I didn’t expect this totally predictable ending. I wish they had written a different one. I’ll mark the spoilers below.