We will definitely look into that and check how difficult this would be. We'd love to bring it to those platforms as well and technically it shouldn't be that big of a problem with the Unreal Engine 4, but we haven't tested it yet, so we cannot promise anything at the moment.
Yes, there will! We already submitted Lost Ember to GOG.com and hope to hear back from them soon! At the same time we are already looking into other possibilities to bring you DRM-free version in other stores.