I really like the general idea of the game and the presentation is quite nice, one thing that id suggest improving is the UX design, its not very clear that you have to select a die and then having to select the same one over and over again could get repetitive. I'd suggest auto selecting the six die at the very least.

Awesome theme, art, and music. The concept has a lot of potential for further development. The only problem (that seems to be kind of common) is that the instructions aren't all the clear. Maybe there could be ways to, not only communicate the controls better, but also streamline the dice selection process (maybe have the first dice selected as default or add a message that informs the player when they haven't selected a dice instead of giving them a 1).

Otherwise, it's a great concept and I'd love to see it made into a full game