In my mind a survival horror game has infinite enemies and just few weapons (or not at all), and you NEVER feel safe.
I don't like them so much because I can't take time to explore or concentrate to the details of the levels... I just feel the urge to run to finish that damn thing.
Half- Life 2 is definitely not in that category.
I don't remember well if there are areas with infinite enemies... maybe the village with a lot of saw ??? But there are very few... in the end it's a classic shooter with a cinematic story added, and some physics related puzzles (that I felt I little forced into the game sometimes).
Maybe I can stretch the "survival horror" category to the Marine campaign of Alien VS Predator (2000), but just because of the infinite aliens and few bullets, but that's it...
To change subject, I started playing
"Slay the Princess" .
The first impression was... 11 GB installation !!!!!!! WTF !!
Looking at the screenshots seemed a "simple" visual novel...
Then I started playing and my brain exploded !! It's like everything is not what you think... at every single choice now I have to think what could mean in reality that "phrase" I am going to choose...
I'm just at the beginning, but I already know I will replay this thing a LOT of times !!!
The most similar game I played like this is
The Stanley Parable, the concept is very similar, you start with a "quest" without details, but you are absolutely free to do different things... the game apparently will restart different times, but with changed things here and there, and so on...