Just to clarify, even though you have reached 40k, that doesn't actually mean you move on to the next stage in development?
Yes. I still didn't finish implementing previous goal features. Finished or partially implemented are marked by color on the funding page. But I work in many directions in parallel (some game options are already implemented). So it's possible what next major release will support Linux or Mac OS. But for now, some huge work must be done in source code to make it "compilable" in other OSes.