The following news was grabbed from Boob! :

This is based upon the 6 degrees of freedom Voxel Landscape engine by Andrey Serba (http://immerse.km.ru). Most voxel renderers only allow for 4 degrees of freedom, and were initially software rendered. This however utilizises KallistiGL for Hardware rendering of the raycasts used to draw the landscape, and produces decent framerates on the dreamcast due to extensive use of the sh4 fpu. In this release you can basically roam/fly around a virtual (psychedelic-coloured) landscape or set the computer to ‘auto-pilot’ mode.

Thanks to Cyrus64 for the news.

The page for this and Cool Herders will be on DC HomeBrew later.