It's only for iOS right now. tvOS is still being evaluated up now, too.
Any devices with a refresh rate >=120 Hz will need to go to settings > frame throttle and enable "sync to exact content framerate" or it will run too fast. We'll change that to ON by default ASAP but in the meantime... For ppsspp-libretro, you'll also need to go to settings > audio and set Audio Sync to ON.
Some users have reported it defaulting to Catalan language. This didn't happen to me, but if it happens to you, click on the gear icon on the right (settings / "Ajustos") and then scroll down to the User ("Usuari") submenu and change the language ("Llengua") to English. We suspect this is Canadians' 'CA' region code being misinterpreted and are looking into a fix.