I'm gonna wait for Steam version
Free work is ok if it's not-commercical project, such as modding for game. If it's commercical and they're going to make money off your work then it's unfair.
This video is a trailer for the upcoming Batman: Arkham VR project that will hit PlayStation VR in October of 2016. In this video game player will completely immerse themselves as Gotham’s protector Batman. They will be able to put on his cowl and use his arsenal of gadgets.
© Batman Arkham, 2016 YouTube Link