Worked on both growing and shrinking of the cubes today.
Most of the day was spent trying to get the coroutine order right, and to have the cube that’s not on the tree be destroyed as soon as you pick the new cube off the tree (so that’s there’s only ever one cube at a time).
Eventually got it so that when you pick a cube off the tree, a new one grows in its place:
Lots of bugs still, and it’s going to be a while before I get everything right.