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.
Steve Gaynor from The Fullbright Company Talks About Strange Games (DICE 2014)
Steve Gaynor – developer of Gone Home and BioShock – talks about creating strange games. Worth to watch if you think about some tricky horror production,