If i see right, parts of the level are made with Blender and was first used in a Gamestudio project called "Hotel California"

Ask rVl_eXile for creating the level as (if i am right) he made the level above.

For the graphics i would recommend using a custom shader solution created for your project needs (shadows, deferred/forward rendering, ...)

Also try using some kind of custom WYSIWIG level editor only for your project to get the most out of the engine, but basic level layout and modeling done in blender.

The post processing in the video is pretty simple, i assume it's only a simple grayscale/saturation shader
material shaders are lighting+shadows and normal mapping, nothing special in particular.

Regards
Felix