A little to late to say but all good to know for those want to create game by choice.
Quote from site :
“Xenko is a powerful cross-platform game engine. Enjoy the latest features of .NET 4.6 and C#6 to write stunning games efficiently!
Import your assets and build your world using the Game Studio. Create scripts with Microsoft Visual Studio and bring your game to life!”
It’s open source as dual license and I think can be to work with Blender.
Enjoy for creating game !