I would like to add Linux and MacOS support although Linux will probably come out first as I could test it alot easier. The problem with supporting MacOS is I don't have a Apple computer therefore it would be extremely difficult to even export the game for newer version of MacOS. Supporting different backends is fairly easy, changing the current one used ingame would probably prove to be more difficult than implementing a different backend. I plan to implement all of the things you've mentioned above in the future :)