I seem to recall green heart games, people who made game dev tycoon, appearing on this forum a while ago and mentioning something about trying to integrate steam into a plugin or some such for node webkit. Haven't heard anything about their efforts since, tho.
Gah I was typing up a detailed post about that while you posted lol.
Previous Steamworks post
Seems like one of the guys who made Game Dev Tycoon posted on our forums last time this came around, before they were on the Steam Store.
To follow up, I posted a thread on their forum to see if I could get a response: GHG Forum post
Hopefully they'll respond here or there.