Neat game! I agree with some of the other comments, I think you also have a nice spin on the dice rolling puzzle game! The sliding is a nice touch and subtracting/adding eyes was cool.
I think it would be nice to be able to see all sides of the dice, maybe by turning the camera or some UI. It might make it a little easier, but I don't think it would detract from the overall puzzles.
You also did a great job of easing in the mechanics! The pacing felt good.