Just some feedback from someone else who purchased through GreenManGaming - if you are thinking of using them to get Driftmoon, don't.
I still haven't been able to download through their Capsule digital distribution software. It runs at a max of 35KB/s, dips down to 20KB/s, and regularly cancels the download due to some unknown error (up to 3 complete restarts after 1.5 hours).
If I was the devs at InstantKingdom, I'd remove your game from GMG as quick as humanly possible. I personally have no plans to use their site in the future, ever again. And that negative experience (for some people) could translate to your game.
I'm going to be picking it up somewhere else now, but thought you'd want the feedback about GMG's horrible digital download service.