There is no copy/paste function on the mobile version. I seriosuly recommend using the PC version instead.
Mods could be available for that, but they are cumbersome to install and maintain on mobile.
I am not sure, since technically the game could be using a gyroscope, accelerometer or both as input. Most likely Temple Rush wont work. But dont worry, there are still plenty of other endless running games that work with touch input.
You can only get them when you have the gear vr itself.
You have to make an oculus account, which you use during the gear vr installation to get your games. You wont loose the game in two weeks as the free game promo is bundles with the specific device that you ordered. When the promo runs out...