Let's take a look at that trailer.
There are no guns in Total Chaos, instead the players must use their wit and the hazards they find in the environment to defend themselves.
Light fires to destroy those who hunt you down, set traps to take down unsuspected enemies. Blunt weapons can be found on the island, but close combat is not recommended.
The mod with the assistance of the source ports introduces many new graphical features, such as 16x motion blur, high resolution textures, 3D models and bloom effects.
The team notes that it's not a straight up mod of Doom 2 but rather a modified version of the Doom 2 engine that utilizes OpenGL, mouse look, and a few other features. However, the team also notes that it's still Doom 2 at heart and you can even use console commands to spawn in enemies as if you were playing some crazy bizarre Doom 2.