Loved it! It's actually one of the most solid concept/prototypes I've seen in the jam!
Like, there's a really cool roguelite game in here with more work and polish. The gameplay is fun and unforgiving (maybe a tad bit much), but as long as you tweak it to make it super dynamic, it's fine.
Dice should resolve faster as I believe others have pointed out; maybe have a dash besides the jump too, which also pushes enemies apart from rolling attacks?
Another quick idea would be that you could customize each side of the die with the items you pick up along the way (attacks, blocks, spells, you name it). That way, you can customize your playthrough for different playstyles.
Maybe integrating rolling dice to the randomization of the dungeon itself? Like, each room rolls a dice, and that room gets N exits according to that roll...
Anyways, sorry for the rambling; I think this is a really cool jam entry and has the potential to be an actually good, fully fledged, successful game :) congrats