Update 1

Interaction system added. Now you can interact with some objects at the hospital.
The weapons system updated completely. Weapon models replaced with higher quality, new weapon added.
Added new enemies, locations and characteristics of some "old" enemies changed.
The hospital is expanded. Added two new branch. Partially changed the old rooms.
The quantity of medkits and ammo increased.
Slow health regeneration system added.
Keys locations changed.
Gameplay is changed partially.