Congratulations on completing the jam!
Tying the rolling of the player to the combat dash-roll was a great way to implement the jam theme. I do think there were a few simple ways that this game could be improved.
As it stands, once the player rolls into a number they are locked into a new random roll after the dash. If the player is around other enemies this requires them to immediately dash or walk away if the roll was too low and then essentially roll left and right until the number comes up that will win. In my opinion, this isn't the best gameplay so what I would suggest is to fix the dice roll after killing a number to be one greater than the enemy's number. This would allow the player to trade up their initial dice roll and plan a path through the lower numbers to gain enough to defeat a 6 (or D20 if you really want to keep that power curve). Unfortunately, this would also need a corresponding negative loop to bring the player's power back down, but I will leave that to you, I don't want to be overbearing with the suggestions.
The music was also great, I am not entirely sure if it was done during the jam because it sounded so good. If so, fantastic!
Great work all around, very impressive for your first month in Unity.