Hi ! On Android, the market is so highly diversified in terms of devices and controller models that we unfortunately cannot test and guarantee compatibility with each one of them, so it is possible that your controller is not compatible with the game, I'm very sorry.
Apologies for lost items. Try killing and relaunching the app. If issue persists, reach out via in-game chat for assistance. If UI disappears, try swiping Quick Settings panel, open/close menu, or kill/relaunch app. Cloud save is now available!