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[AuXAuV]

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[Venom]

Nice,

[KD197]

Not bad, but it could do with a few different textures. It all looks the same to me and that makes it slightly bland. I see what kind of look you're going for, so perhaps some atmospheric lighting would help if you don't want to add more textures. For example, dark areas with lots of uplights along the base of walls. Some metal plating for platforms would be cool too and would mean you could have different footstep sounds.