This is so good! Really enjoyed my time with it. I lost to the boss the first time, but in my second run I managed to eke out a win with just a sliver of health left.
Drawing the dice cards (or rather, not drawing them) was sometimes a bit brutal. I wonder if having the dice roll automatically every round, and having only cards the modify (and then obviously also rebalancing) would feel nicer? You could have upgrades then that lets you roll more dice per round, etc.
Loved the shenanigans you could get up to with the x2 and +1 cards, and the restrictions on attacking certain enemies (e.g. only evens) was really fun as well!
Because the cards discard at the end of a turn, and there's no cost to playing a card, there was often not much incentive for me to not just play out everything every round. Might be interesting to see what a card playing cost does to the game (even if some cards are perhaps zero cost or whatever).
I also would have liked to have seen some way to heal a bit. I know that hitting the exact number heals you by 1, but that feels kind of meh (in fact, it does feel a bit bad for putting in the effort to get the exact value for such a paltry reward). Maybe skipping a card could heal you? Or it's a separate thing that only happens every X encounters ala Slay the Spire? Or maybe you can have cards that use dice values to heal rather than do damage?
On that same note, I kind of wished I could defend somehow. I.e. when you get to the boss at the end, you basically just have a countdown of how many turns you got to beat it (which is just HP/10). So on my first run, I had like 9 HP left, so the fight felt very futile, because no matter what I draw, I can't beat it.
Anyway, great game, great art, and nice mechanics. Bravo!