A very cute idea executed very well.
The choice to make the die spin based on where you hit it rather than randomly rerolling it leads to some great opportunities for optimization and makes the player feel in control. As a personal challenge I found myself trying to use as few moves as possible.
One feature that I think would have made for a great addition would be the implementation of a juggle count per level. Stat tracking with no extrinsic rewards are a great way to add replayability and intrinsic goals to a game like this.
I think the mechanics are simple enough that it may have been in your best interests to do a tutorial that doesn't use text, such that you're not limited to players that read English. Plus in general people prefer to learn by doing rather than reading.