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Let me also add Strife (1996)

-It also has Doom-like combat, but it's much more FPS oriented and has more complex action mechanics than ROTH.
-It's sci-fi/post apoc but it also has a strong horror element.
-It has lite RPG and adventure elements. You can choose to side with different factions and the game will unfold differently.
-You also have a female sidekick that comments on your actions, offers advice, etc.

All and all Strife has many similarities with ROTH and IMO it's a great game that should get more attention.