 If you liked
Nekojiru-sou
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 ...then you might like
Chika Gentou Gekiga: Shoujo Tsubaki
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Both are fairly short, (Nekojiru-sou only being a 32 minute long, 1 episode OVA) and both are very meaningful while not showing a lot and using less motion in their animations. On that note, both are very interesting artistically.
Nekojiru-sou is DEFINITELY not as gory/dark as Shoujo Tsubaki, but I enjoy both of these and feel like they give off very similar type of feeling while watching them. Even if Nekojiru-sou isn't as dark/morbid.