The codes used to make this game are adapted on iOS devices, it cannot work on a computer.
Actually... OTM could use this is any C variation code, it is just the app store only takes C- code which can be altered from the code you use for computer games. Nonetheless, OTM could easily have this coded onto a computer version... The arrow keys work like the compass for going forward and changing the view from left to right. Scrolling in and out will change the view from first person to 3rd sort of. Then finally the clicking on the screen can be used to have the vision go up to the sky or down to the ground. That would be the basics, then they just have to change the code for the rest and slightly alter the art, by which on a computer can be a lot better.
But also if they are using Xcode then they are already creating the app on a computer and sort of previewing it through an iOS device, but will need to send the preview to their devices to test it out themselves as not everything you see on the computer version of an ipod/ipad/iphone for iOS games is completely true.
I would say it could take OTM 1 year to get this game online, but if they happen to do that, then 1) they will need a bigger team, 2) they will need to have longer time updates so like 2 years instead of 1, and 3) more money.