Huh? Use the remote app on your phone. It automatically pops up like a notification when there’s a text box on the screen. So easy. You can turn the box off by holding the power button for a few seconds. To close apps, you double tap the TV button and then it’s an iOS like interface that you scroll over and swipe up on the ones you want to close.
The UI is very minimal and the same across most all apps, so it’s easy to learn and use. It may be missing some power features, but most things are accessed via clicking of just holding.
If it’s made in flutter, doesn’t that mean you easily publish it to the iOS App Store? Isn’t the main point of flutter to publish to both iOS and Android?