Siren Head Sound of Despair

It was just a few months after the bombarding in Belgrade. The Year was 1999. My husband and i went camping near the city.There is a nice piece of nature there. Trees, grass, fresh air... But then it happend! I woke up and my husband was gone! I must find him. Hope he's not hurt. Hope is all i got now.
Once i start to search for my man i encounter him... Siren Head is his name.Was this some kind of military secret project or some strange mutation?

I have to fight it, have to kill it...

Mouse 1 : fire weapon
Mouse 2 : raise sights or block
W, S, A, D : move player
Left Shift : sprint
Left Ctrl : crouch
X : prone
Space : jump
F : use item
R : reload
H : holster weapon
C : Change Camera View
V : melee attack
M: show map
Esc or Tab: Pause