What is the Professional Tuba game, how does it work?

According to the introduction of Alyaka, Professional Tuba is a Music game on the Android platform. There is currently a 1.1.0 version released on Dec 17, 2016, you can see the details below.

Professional Tuba is a virtual music instrument application.
This is a Virtual Tuba application for android mobile phones and tablets. High quality sounds from a philharmonia orchestra, New and noteworthy featured app, Multi-touch lets you play chords. Good quality of screen resolution.
You can play the instrument in your tablet or mobile phone.