I have been following him, and I think a lot of the claims about him have been exaggerated. He stopped being so edgy on twitter after watching the "this is phil fish" video. It is an interesting watch and applicable to notch.
https://www.youtube.com/watch?v=PmTUW-owa2w
He is developing a new voxel-like game called "levers and chests", and before that he has shown us a few cool webgl demos I find interesting.