Voxel Game Engine test ( Super Mario 2.5D 3D )

Current state of my Voxel Game Engine and a test application (work in progress) to see if a game can be written with it. The engine now takes advantage of more CPU cores. (Such as 4/8 core Mac Pro. This video shows it running on 2.0GHz Core 2 Duo imac).
The engine (software renderer + 3D sprite engine) is written in C++ (SDL for convenience and OpenGL for final image blitting). And now works on OSX, Windows and Linux.