There are a few tricks that Ubisoft implemented in the game to mitigate
nausea. For instance, you turn using only your head, rather than a
joystick. It feels pretty intuitive, too. The only thing that takes a
little getting used to is tilting your head to make sharp turns, since
this is not a movement that you’re likely to do in every-day life.
Luckily, it took me less than an hour before it became second-nature.
While the game requires a controller, you’ll only use it to slow down,
speed up, attack, and shield yourself.http://www.gamespot.com/reviews/eagle-flight-review/1900-6416556/
It mentioned clearly game do not rely much on controller, movement is very much head based and graphics are also cartoonish thus not much heavy no system. Since any tethered game platform like PSVR or HTC VIVE or even OCULUS RIFT can not provide complete wire free freedom of movement. its very very attractive to enjoy on gear vr. Now that XBOX controller also available on GEAR VR there is really no reason to porting it.
There may be some graphical shaving off required, reducing number of buildings still game can easily be ported to Gear VR, it has all potential to be one of the MUST HAVE title on GEAR VR.