PaterAlf: The game doesn't seem to be a big hit. Numbers from SteamSpy after the release day:
Owners: 6,754 ± 1,794
Players in the last 2 weeks: 1,327 ± 980 (19.65%)
http://steamspy.com/search.php?s=witness Half the owners already bought the game while it was in beta (or pre-ordered?). So on release day only about 3300 people picked up The Witness on Steam.
It's common knowledge that SteamSpy is not very reliable for a few days after release. So I googled for confirmation.
From the creator of Steamspy, to a "How accurate is SteamSpy?" question:
" Hi
Creator of SteamSpy here.
It has its limitations, namely free weekends. Anything below 30K is wildly unreliable. And you need at least 3 full days worth of data, so new games are also a bit off.
But it's good enough to research the market. I'm an analyst at my day job and I'm using a lot of really expensive tools (we're talking >10K dollars per year for each). SteamSpy is one of the more accurate ones actually :) "
Lets wait a few more days...
PS: Although already has data for at least two weeks. So I don't know if it's a few days since release or since the data started to get gathered.