The most recent hint "In it's current form, it's very much un-Gog like." suggests that there are multiple versions of the game and while one of those versions may be on GOG, this screen shot was taken from a version that is not on GOG. However I also think that it is entirely meant to mislead.

If it's 'un-Gog like' and somewhat obscure, then there's very little chance I would have come across it.

Team Fortress 2, Valve owned and has cartoony graphic. Have you stuck the graphics in a low res and settings to help hide it? Cause that's a real cool idea you can make some over wise obvious games look unrecognisable doing that.

I remember that game. Its called WARP.

It's needs an EA/ORIGIN-activation. I think that is the meaning of the un-Gog likeness. But its a complete single player game. If the necessary of EA/ORIGIN would be removed, it would be a good candidate for Gog.

Correct, surprised anyone got that.