 If you liked
Jigen Sengokushi: Kuro no Shishi - Jinnai-hen
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 ...then you might like
Kyomu Senshi Miroku
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Both have ninjas and science-fiction themes like spaceships and advanced technology. Black Lion is based on a Go Nagai work and Miroku is based on a work of Ken Ishikawa, both worked together in the creation of some mangas and have similar styles
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Recommended by aburame_ernesto
Both OVAs are about ninjas in ancient Japan using mystical powers to fight alien technology. They were also written by Go Nagai (for Black Lion) and Ken Ishikawa (for Miroku), long time best friends that worked together in many series.
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Recommended by Ionliosite2