Great concept, Reversi with power-ups and dice mechanics. Good game design, UI, art, and sound effects (I see you used pre-existing assets, but they fit well).
I only played through once, but it seems that if you're good at capturing opponent's pieces, then the roll of the dice doesn't really matter? It does help if it's a close game though!
I'd try out small tweaks to the GUI, like showing how many dice you have left in the bag, and how many of each type you have. Also I wasn't sure if higher numbers on the powerup dice meant a more powerful effect (can pull, push or destroy more dice/from further away) or just a higher score for that dice.
Anyway, really impressive, good job!