Mitsuami no Kamisama

Both share a very similar philosophy. It's clear that Pigtails was inspired a lot by the novel of NotGR (as many other Anime in the medium). If you likd one, you'll definetly like the other. 

Both share similar color palette, and ambience - though in Todorov Roddle the conclusion is most of the times lighthearted and, in this short movie, it is not. There is a lot of surreal symbolism in both, and a sense of void, and loneliness. 

In both shows, through their simple presentation, are presented a lot of social parables and dilemmas. In a sense, this short movie could fit in Kino's setting quite well, so as long as one had enjoyed Kino's Journey, you'll enjoy the short movie too. 

Short animations that seem cute at first, but have a surprising twist.  

Although they are very different, they have some moments that give a similar feeling. Both are heavily philosophic and both are a little horror-ish at times. I can't exactly explain why, but they seem to be similar in my eyes.