Attack　of Titans

Expel the giant who marches one after another using
the gun installed one set at a time in each rampart from right-hand side!
It will be game over if all the ramparts are broken!

【The operation method 】

A red button is pushed.　→　Charge!!
A red button is released. 　→　Discharge!

It will be discharged accidentally if the part driving distance will come out if a button is pushed for a long time, but it stores too much!
Since a gun requires time for reloading once it shoots, it aims and often shoots it with it!

【Enemy】

Small Titan　　・・・Margin!!
Medium size Titan ・・・ He is a troublesome fellow, when power is stored and it rushes.
Flight Titan ・・・ It will be one shot if it guesses. A motion is gloomy.
??? ・・・ He is an enemy of the human-beings strongest! Start with care!