As of June 23, a week since its release, Radiator 2 on Steam is rated "Very Positive" (85%) out of 595 user reviews, which seems pretty decent to me. The store page has gotten about 9,000,000 impressions (number of times someone has seen a link to the store page) and about 500,000 actual visits (when they actually click that link). (Moral: there is definitely an audience for gay stuff on Steam, let's put more gay stuff on there.)
There have been about 34,000 downloads total, with a peak of 132 simultaneous players on the day after launch. 18% of downloads are from the United States, followed by 10% of downloads from Russia, 7% from China, 6% from Brazil, 6% from Germany, and 4% from France. (Moral: localize your game! A lot of the world doesn't use English!)
As I've always said, numbers don't really mean much in the end, but I guess they're fun to think about. If I were selling this game for like ~$5 USD, those user numbers would've qualified as a respectable commercial indie effort that easily funds another project... But in terms of free games, many of which get hundreds of thousands of installs, Radiator 2 is more or less within the statistical median between "ultra obscure" and "viral", which I think isn't too bad for a 15 minute compilation of 1 year old gay sex games.
Here are some quick write-ups at Rock Paper Shotgun and Eurogamer, and here's a more in-depth interview with Nathan Grayson for Kotaku about more of the details behind putting and maintaining something on Steam.
Now, what's next? As I told Nathan, I'm currently re-conceptualizing the gay bar game, and I'm also doing some more technical design work for that Robert Moses game, which will hopefully be done in late July.
