I can't think of other games set /on mars/ and /with demons/, but the broad weapon archetypes (shitty single shot pistol/rifle, shotgun, bigger shotgun, high fi

I can't think of other games set /on mars/ and /with demons/, but the broad weapon archetypes (shitty single shot pistol/rifle, shotgun, bigger shotgun, high fire rate chaingun type thing, 'BFG' esque super weapon) and doors with keys thing were both aped by a lot of games. And there were certainly other FPS games with demonic themes. Regardless, 'Scavenged Present Day Military Equipment on Island' is a much less distinct theme than 'Demons on Mars'. ... I think calling the Settlers and Syndicate RTS games in the same vein as Warcraft or Command and Conquer is a stretch. If you compare the latter two to big RTS titles released even years later (Age of Empires, TA/Supreme Commander, Dawn of War 1 are some examples I can think of that weren't made by the same studios as Dune/C&C/Warcraft) you'll see all the core mechanics are still the same - base building, unit training, economy, UX conventions. The Settlers and Syndicate are lower case real-time strategy games, but they aren't 'Real Time Strategy' games.