A free app for Android, by Super Emulation.

If you want to enjoy playing classic Nintendo games on your Android device, you can install the Super64 Plus. This is a comprehensive emulator that will enable you to run different games on your phone or tablet, but it requires Android 5.0 and above.

This emulator features auto-saving, saving state, and loading state. It also has all controls, such as analog & D-pad & L+R+Z buttons. With this application, you can also easily resize these controls and edit them. To edit, simply go to Profile → Touchscreen. Then, tap on copy and rename.

It is very simple and easy to use.