Noticed something awesome while playing
Whenever you are in the dark without your flashlight, I want you to walk up the Alyx really close (you'll be able to find out where she is by the light in her corneas). You can actually hear her breathe through her nose! It's those little details that I absolutely love that make video games like Half-Life II Episode I truly awesome.
Also, something that I think pretty much anyone knows which is awesome is that if you shine your flashlight on Alyx in the dark, she scrunches up her face and tries to block the light with her hand. But what's interesting is that she ONLY does that in pitch black areas. If there's some light in the room and you shine it on her face, she won't do anything. At first I thought that the game developers forgot to incorporate that, but then I realized that, like in real life, you won't really be blinded by a flashlight if there is another light source in the room.
That's pretty incredible. I'm gonna try and find other little details when I play the game, as well as playing the previous Half-Life II game. I'll post them if I find any.