There is a "no webcam - use leftclick to blink" option, I'm 15 minutes in, and I could see a good bit of the narrative being lost that way though.
Could you elaborate a bit more on that?
How exactly the narrative gets lost?
If it's because you'd need to mentally disassociate and pretend to yourself that you clicked instead of blinked - I can do that, no problem.
You look around with the mouse and otherwise just follow the story. There are two situations where you can trigger something by blinking. One, something has an eye-symbol and can be activated by blinking and two, there is a metronome at the bottom of the screen indicating that blinking will conclude the scene. Well, thirdly, a lot of scenes might have neither for a bit, so you don't actually have to stare nonstop.
The first one doesn't really matter and could just as well be a mouse click. The second one seems to be more of the kicker, because you want to see how the scene plays out ("hold on to the memory") but it can be longer than you would normally keep your eyes open, so you do have to deal with a bit of a real life struggle to hold on to the memory (and maybe you blink, and the scene concludes).
I haven't tried using the mouse option yet, but if every scene just stays up till you click, you are missing out on this sense of physically struggling to stay in the scene, which feels like a bit of the point here.