Fixed some things, broke some other things. Added a mob with a very simple chase function. More to come.
Some more digging in this video, you can see the marching cubes shapes are a bit jagged and lighting is bare bones / rough. Work in progress. I have some old light spreading / radiosity type code for 3D voxel arrays in minecraft type worlds but its pretty tricky stuff and may take a while to adapt and implement. That along with water.