Very solid UI. This is a really creative take on the theme and its executed super well, but I have a few irks design-wise:
Just walking straight forward with a die full of the default 1-tile spell seems to be a preferable strategy to upgrading your die at all. The only downside is that you have to spend 1 more turn with moving to be in range, but then you consistently hit the enemy. I don't see the point of the upgraded spells at all, since you only fight one enemy at a time (so covering more tiles is pointless). There is also no indication of what the enemy will do so you may react to it.
Still, very interesting game. I like the concept a lot