I like how the dice roll in a predictable way, which makes it easier to land the sixes :). Without it, it would really be pure RNG in the later levels, so nicely thought out. I also like the RPG scene that you have set up, that's pretty cool!
I think what could really elevate the fun would be to add more feedback to the attacks (with sound effects, spicy visuals) as well to the health of the player and the enemies' (a draining bar for example). I could also continue playing even with negative health, not sure if that's intended, but no biggie.
Congrats on the entry :)!