Thrills, chills, and gently rolling hills are coming on January 30 with the launch of dreamy explore 'em up Proteus on PC and Mac. For $9.99, the playable song will send you off on a lovely countryside stroll, playing with local flora and fauna to build a wonderful procedural soundtrack. Wear sensible shoes and bring a packed lunch.
You can pre-order from the Humble Store for $7.50, which will get you a DRM-free version, a Steam key when it launches, and instant access to a beta build. A Linux edition will follow later.
Check the announcement post for more, and look at this delightful video game: