The core concept here is really cool! I like the idea of building out dice with different attack values, and different elemental effects - almost like a deck-builder, but with dice!
One note I have is that the feeling of the platforming could use a bit of tweaking. The player slides a bit too much when coming to a stop (at least in my opinion), and there doesn't seem to be a jump buffer of any kind. I think adding a jump buffer/coyote-time would go a long way to improving movement feel.
All things considered, you did a great job!