If the game freezes, just click inside it (games can get unresponsive if you click elsewhere on the page).
This is a deserted cemetery. The history is very long. When it comes to the night, the blood will show on the gravestone. So, many bats will come here. They are monsters.Please kill them all.
Mouse to shoot.
Q to change the weapons.
A to use guided missile.
S to use bombs.
Space bar to open/close aim point.