I do.
It is a really cool game, full of potential.
Also, it is a reminder for me for never going full digital. I rather have a rare disc/media break on me, dissapear or be stolen than just having something not available anymore for reasons beyond my control. I know it was a freebie but the fact that once my HDD goes out, I will never be able to play it again is just... painful.
I have over 400 titles on Steam but at least to my knowledge anything that has been been available and purchased is still available in my account for re downloading, even stuff that is not for sale anymore.