Yeaaaaaaa! They actually created Steam too.
Personally I love HL2, main reason I want vr is for HL:Alyx because I'm a huge nerd of the half life series
Yes, Steam was originally meant to be a page for all their games, then they decided to expand it and let people put their own stuff on there.
Ever since i played HL2 and loved it I did a ton of research on valve :p