Hey everyone.
I just want to let everyone know that Subterrain can also be purchased by Humble widget on our official website.
http://www.pixellore.com/
Default price for the game through widget is 14.50 USD at the moment. This is because there are less overhead payment involved.
For every different distribution platform, we choose to op-in for their default pricing based on USD price, so if you happen to find the widget price a little bit cheaper for your region, you may want to purchase through the widget instead. It's just a choice, you will get the same Steam key.
Thanks everyone!