What is the Semaphore Defender (Unreleased) game, how does it work?

According to the introduction of StufCo, Semaphore Defender (Unreleased) is a Educational game on the Android platform. There is currently a na version released on Feb 13, 2018, you can see the details below.

Learn the semaphore flag code while defending the seas from enemy jets. Match your flag positions to the letter on the planes to blow them up. Translate the flag-based messages of fellow sailors back into letters. Get points and find success!