Aliens have invaded Earth!!!
Don't let that happen!
You save the earth!

Easy to use
Since there is a sight in the upper right of the screen, do not miss the moment when the UFO overlaps there
Just tap the screen!
Then the missile will fly towards the target.
If you miss 4 times, it's game over.
However, there is something good if you can defeat a rare UFO!

Now, let's compete with defense forces around the world for your score!