I like the demo..It has an athmosphere. That can also be important to show some techniques and I like the "lite c beer" esteregg :]
The size of that demo is really small, but if you want to make for every aspekt of the engine a own demo it's ok.

but as mentioned before some things are missing.
The thing annoyed me most was the cam...too fast and jerky.
The second thing is the halo effect. It could be avoided by comparing the pixels of the depthmap.
The 3rd thing is: This demo should show what this engine is able to do. An easy enviroment mapping(maybe with normalmapping) on the floor would already do a great job.(look at hl2 how they did it...).
Maybe also a little (not too intense!) bloom shader.

Also if this shall be a shadowdemo. If there are some ugly blocks it just lowers the opinion of the player.

edit: played it again...I'm not sure, but is there a bloom if something is behind the rays of the windows?