63
Islands of Insight is free to keep forever until tomorrow, June 27th
(store.steampowered.com)
Steam is a video game digital distribution service by Valve.
Steam News | Steam Beta Client news
Useful tools:
SteamDB
SteamCharts
Issue tracker for Linux version of Steam
The game sells your info apparently... points 4.3 and 15.4 of the privacy policy (age, gender, location, etc to advertisers).
I did not look this up myself, it's just one of the many reviews talking about this that provides this information. Credit to steam user Ilovemyhouse.