Tenshi no Tamago, Casshern Sins Recommendations
These two anime share a strikingly similar atmosphere. Surreal, dark, otherworldly sci-fi. The settings are post-apocalyptic, lonely wastelands where the characters wander with little to no dialogue. But when the characters do speak, it's most likely an esoteric line that ties into a deeper overarching theme. Casshern Sins features inserts of streamlined fight sequences throughout, but otherwise, both anime's pacing are a contemplative slow burn, accompanied by gorgeous music and artwork.
Both have a very calm, unearthly feel and take place in a strange, desolate post-apocalyptic world. They also invoke thoughts about human nature and religious symbolism.