Original Description:
(Translation) Move the turret left and right with your mouse to kill the soldiers.
Press the mouse and a power meter will appear at the top of the screen. When you release the mouse, the shell will fire depending on your power.
Soldiers gradually approach while throwing grenades. When soldiers come closest, it's quite annoying to throw grenades, so kill them as soon as possible.
Nice to meet you. Shockwave debut. Please enjoy!