I think an important aspect that's kinda faded away here is the visceral detail of the zombies, which were unusual at the time, mixed with the fact that you nee

I think an important aspect that's kinda faded away here is the visceral detail of the zombies, which were unusual at the time, mixed with the fact that you need to utilize the physics engine to get around, which created a unique kind of "panic" since at a glance there often seemed like there was no escape from certain circumstances. If you want a similar feeling from a more modern game I recommend trying Prey (the new one). Terrible name that doesn't fit the title imo, but playing it felt similar to when I first played half life years ago, more than any other game I've played since then at least (except Half Life: Alyx).