I only got to watch this in Let's Plays initially. I think it was Tobuscus whose playthrough I watched first. But the visuals, and the "story" fascinated me, and the soundtrack by Austin Wintory had a profound emotional effect on me. I finally played it myself a couple years ago and it was as admirable as ever.

Fun fact: One time I made a post about Austin Wintory on the subreddit for the TV show Firefly, and out of nowhere Austin Wintory himself was the sole respondent to the post. The internet is weird.