I assumed android would lock the FPS to 60 so I removed the option to adjust it. I'll take another look, maybe it can go higher.
There is no developer mode on Android (it would require more work than I can do in my spare time).
It detects a gamepad automatically, you will see a gamepad symbol on the title screen bottom-left. Something like a USB C cable might work (it works for me), or you would have to pair the gamepad wirelessly in your phone's settings - I recommend turning to the internet for advice on that one.