Single player FPS auggestions - Lemmy

Can you give auggeations to try for preferably indie single player campaign FPS that does hace creatures or aliens, or takes place in space?l. I’m not into the Doom games because of the martian creatures, or Halo games due to seeimnfly a space theme. I tried Half Life 2 since people demand a Half Life 3, and after 45 minutes I lost all interest in Half Life. Is there an indie version of Medal Of Honor? I do not play online multiplayer at all, and no third person games of any kind.