Keep Still!

## Description

When you tap start button, a game starts.
A game starts after 5-second countdown.
When you incline a device, the green target moves.
You place a green target in the center of a yellow circle and delete a yellow circle.
When you delete a circle ten times, an elapsed time is recorded.
Please compete for the shortness of the elapsed time
It supports GameCenter which can compete with a world player.
Please challenge the limit.