Not strictly a game, and not following the theme :) But i spend most of GGJ17 implementing Marching Tetrahedrons, to create a voxelized planet building tool. Use a 3 button mouse to play propperly. FPS controls: Right click hides the curser, Left click draws/erases the voxels, Middle click swaps between build and erase mode, Scroll up/down changes brush radius.
Tools and Technologies:
Unity (any product)
Implementation of Marching Tetrahedrons, wrapped around a subdivided icosahedron (20 sided dice).