Super fun puzzle mechanic! One suggestion if you intend to continue on this project: People are pretty familiar with how dice look and behave. I think it's more confusing than helpful to change that by showing the value of the top face twice instead of just showing the actual value on each side you can see. I get why you did it, because it can be tough to see the pips clearly, but I think the solution to that is to just fix the alignment of the pips on the cube. In addition to simply contradicting the way people expect dice to work, the way you worked around the hard-to-read dice adds an element of mandatory trial-and-error which I think goes against the spirit of a puzzler like this. By only giving us the value of the top face, you require us to blindly roll the cube once in order to fully determine its initial state.