Although it was created as a sample for programmers, you can play as a simple shooting game, so please try to play. I will defeat the earthworms that come out in large quantities. If you reach level 99, all clear! (You can go to the end in about 5 minutes)
Use the virtual controller at the bottom of the screen to operate. You can adjust the size of the controller with the Y button.
In the initial state, characters for debugging are out, but you can erase them by touching the top of the screen.
It is judged as "designed for mobile phones" according to the specification of the play store, but if anything, it is designed for tablets (around 7 inches is the best). Of course, even smartphones will work.
[Known Problems]
In Android 5.0.x, an error indication may appear at the end of the application, but the processing is completed without problems. This is fixed in Android 5.1.x, so please note that it is a malfunction of the OS. This problem does not occur on Android 4.