This is only a demo. Sergeant MK 4 has made this only so that he could experiment with destroyable environment in the GZDoom Engine. What a great result! The only bug that I have encountered Is that when you reload your rifle, and you have no ammo left, it disappears preventing you from using all of your weapons. Other than that, this is the best representation of what it is like to find yourself in a jungle full of enemy soldiers ready to kill you before you kill them (I guess, I have never found myself in such situations).