Besides the obvious Half Life sequels of course, which I will definitely be revisiting.

It reminded me of how incredible Half Life was, and the forgotten relative merits of the genre which, in my opinion, include:

• A lengthy, involved single-player campaign rather than a military throwaway
• Completely linear but well-designed levels with a clear story
• Non-regenerative health and armor pickups, manual save mechanics
• Consistent introduction of varied weapons, mechanics, and enemies requiring different strategies
• "Wow" moments
• (Bonus for sci-fi environments. Love the research facility)

I desperately need more (alongside the sequels). What would you peg as spiritual successors or stand-alone FPS that meet at least some of the above? Some I thought of:

• Metro series (loved 2033, loved Last Light, need to purchase Exodus)
• From what I've heard, Wolfenstein (not sure which entries)
• I'm guessing Doom (never played any entry)
• Titanfall 2 specifically (short/regenerative/apparently still amazing)
• Bioshock (Wildly different art style but some similar aspects)