I remember the day Line Rider actually came out. I remember seeing it on Digg, and this was before Youtube but people were theorizing if a loopty loop would be possible (oh simpler line rider times!). I remember hacking something together into a (flash) video back then. I think I may still have it laying around somewhere.
EDIT: Yep, here it is, "Date Created: 9/23/2006" which is the day Line Rider came out according to wikipedia.
Youtube existed back then and for me line rider was a phenomenon that increased my use of it, one of my first liked videos was line rider jumps the shark, from 25sep2006. I remember watching many line rider videos back then.
But this is about 10 levels beyond that! Only now do I see I didn't take things far enough by half - this is beautiful and... complete. Just amazing!