Hi there,
I just tried to see it in the Steam-Store here in Germany (but it's similar in other States probably) and couldn't access it.
The Reason for this has been explained by this guy, I think:
There are a few work-arounds, of course - some of which seem to be to get a "USK"-rating (or respective agencies in other countries than Germany) for the countries, that won't allow Media to be published/sold without a proper age-"marker".
'Hope that helps make your cool game more available for people in those countries like Germany. I remember playing the Demo of your Game and found it really cool. But it's a little hurdle - more for some than for others - to have to use a VPN or something similar to get access to Adult Games, of course.
P.S.: And if Steam detects the use of VPNs, one's account also might get suspended (temporarily) since it's against their "Terms and Conditions", I ready on some of their pages...