Zombie Horror In Hospital

When you wake up in the hospital, there are a lot of monsters all around you. Where did they come from? What's difference does is make anyway? Just grab the gun and shoot them all. There are no other living people in this hospital, just crowds of monsters and a lot of blood.

Control keys:
0,1,2 etc. - Weapon change
WASD - Character movement
SPACEBAR - Jump
SHIFT - Sprint
Esc - Exit the menu
LMB - Shoot
RMB - Aim