Stand in front of the Kinect ... wait until the colors turn bright, indicating that the game is now tracking you and then start moving your arms as if you were flying. Fly with the bird trying to collect coins while avoiding airplanes and make your way all up into space.
Windows only (really sorry).
Install (or make sure you have installed) DirectX, .NET 4.0, Microsoft Visual C++ 2010 Runtime and Kinect SDK.
The run: release/THYFTHYF_Installer/setup.exe