Not sure if i get your point BlueLemming :)
At current state the app can create this tile with only 2 images (front and side) and both images are exactly the same...
If you would like to work on the top image outside the app (on Aseprite or Photoshop..) You can export the Ortho image (6 sprites) and work on the image before reimporting back into the app to create the rotation sprites.
It is not needed to start with a 6 sprites image always (a 6 sprite image is rather complicated to perfectly create), mostly 2 or 3 images are enough for simple common geometry.
Hope I answer your doubts.. Many thanks for your feedback :)
