I tried out the executable on a PC and it is really inspiring. Nice work!
With Map selected and in scene mode I can see green wireframes after using Initialize nXn Area, but nothing renders in game mode.
On a Mac and new to Unity -- is there something obvious I am doing wrong if I can move the camera about but nothing renders? I installed Blender and can open the Blocks asset. The project builds with 4 warnings but no errors.