TL;DR: Do you have plans to update your Windows app anytime soon?
One of the main reasons I backed you was that there would be Windows Phone app which than was dropped for a Windows 10 (mobile) app which was fine for me. But it seems you have given up on that app, it is not updated anymore since month and not on pair with Android and iOS app.
I know the marketshare of the mobile OS … But still, as the app also runs on millions of Windows devices (e.g. for configuring the app) it is not useless to have this app.