I'm afraid not, the files are simply too big, and we are more or less trapped in an older version of unity, rather than one of the newer ones that might ease the transition.
Mac is a big question mark, we're going to be determining if we can do so once we've finalized the game, due to the fact we're stuck with an older version of Unity rather than one of the newer ones that makes it much easier to convert between platforms.
Mobile is flatly impossible due to the file size issues. Or rather, we COULD do it, but it would probably use up far more space on people's devices than they'd like, and thus the time, effort, and resources necessary to retool the interface for touch screen would far outweigh any possible sales on mobile.
