Neat concept, but currently is very hard. Beat it in 4 or 5 attempts. Exact countdown should be significantly buffed, especialy as it's the only way to restore Energy.
Would love to see a further development of the concept, like Odd enemies, or enemies that switches between Odd/Even every turn, special types of dices, etc.
Also some QoL features to consider: make it possible to box select several dices and drag them all on enemies (also show the sum of the selected dices); add sorting button for dices so it's easier to evaluate your possibilities.
And keeping dices not only between turns, but between rooms as well would be cool. Maybe as a perk or something.
Art is great, though the final boss looks slightly offensive to me :)
Overall, great work!