buy Ostriv Alpha 2 to support the developer, but keep in mind that the game is still in development

You get a downloadable DRM-free copy of the game and life-long subscription for all future updates, including a Steam key, when Ostriv will be available on Steam.
(Powered by Humble Bundle)
Make sure to enter email address correctly, you’ll get a download link on it!
You can then download new versions with the same link.

system requirements

The current release targets Microsoft Windows OS (Windows 7 or newer), with Linux and Mac on the roadmap. You will need a multi-core processor and a powerful gaming video card that supports OpenGL 4.3+ to play Ostriv. GTX 770 or better is recommended. Integrated Intel video cards are not currently fully supported. Some Radeon cards may experience reduced performance at this point.