We haven't forgotten about Linux, don't worry. In fact we are hoping to release two of newer our games as native for linux soon.
Legend of Crystal Valley and others are based on a combination of technology that is not simple to port to linux. Mac porting was horribly complicated but we managed to pull it off somehow. We had some serious problems getting the linux port to work, so I can't promise you that we'll go through with it after all, especially considering that we have to provide support for it.
However, most of our newer games are based on C++ and OpenGL which makes linux porting much easier. In fact, some of the Kaptain Brawe's developers were working on it on Mac and Linux systems