Looks great.
What does concern me is the VERY limited view distance. I assume this is a micro-voxel engine. So that in that small space there are millions of voxels. Scaling that up to give a reasonable draw distance is a challenge I have not seen anyone live up to yet.
I mention it in the video, but it is somewhat buried - view distance is more a data loading problem than a rendering problem. I just have to optimize for faster data loading (right now it happens on the main thread so it locks the program for bigger data loads/unloads and makes it lag). Still pretty early in this respect, so a lot of room for improvement there down the road. I am friends with Branislav (Atomontage) and a long time fan of Ken's work. :)
If you like this style of engine check out http://www.atomontage.com/ and Ken Silvermans http://advsys.net/ken/voxlap/pnd3d.htm
Keep up the good work.