David, your idea to create a simple program to animate the minecraft'a is great but the program needs some improvements in order to become a professional program like Cinema 4D or Autodesk Maya. For me everything what is missing in this program are:
Shadows,
3D modeling block (the block should appear in the mini-grid of squares which, when selected, you can separately edit: change the color, move into the muck, etc. The most useful it would be to the bookshelf and more this creative fantastive animation),
And control every second of your animation as if the timeline will be two points next to each other you can not edit the transition from one to the other. Then Mine-imator has to be a program that deserves to in my 3rd place after Cinema4D and Maya.
Greet ZoeCV