Really fun and well executed. My main complaint is the fireballs don't damage right away so they just block the player from moving which can get tedious with multiple sources in one room. It would be cool if the different dice have different animations, but that's not a complaint and just an idea for you to develop this more.
Also, I'm a sucker for a good collectathon which this balances well with the usage of what you're collecting.
Edit to add it would also be nice to attack in any direction.