This is just one reason why Ren'Py is such a good engine to use for creating visual novels. It can build executables for Windows, Linux, and Mac on a single development machine. It also provides so many other features that I've come to expect in VNs, but which many non-Ren'Py VNs lack (such as the growing number of Unity VNs that don't allow players to easily rollback with a single key press). I've yet to check out your demo, but I'm preparing to remedy that soon.