I completely forgot to post my own video here.
There’s a few things I discovered after making my video, and some stuff I noticed in yours:
- There’s no need to shoot the vortigaunts, you can walk past them, open the gate and jump down without taking damage.
- Don’t use the ladder; fall. But I think you know this.
- You can also just run past the turret there, it aims for the headcrab first.
- No need to shoot the Barnacle, just run past it.
- Crouch-jumping over the final laser loses no speed and saves you having to shoot the turret.
All those things you just run past, you’d need to shoot if you aren’t on Easy, which it looks like you are in your route video.