This was hard! Well done, I think the dungeon growing mechanic is a really unique take on the theme, I wish I could hear those brainstorms as a podcast episode or something :D
Gameplay wise, I sometimes had weird feedback where I couldn't move but the move still counted, dus reducing my dice count, which I found was rather hard on the player. I was stuck against a blue thing. All in all, I think it may have been a bug. My second and third time playing went much better, but it's really up to having some bad rolls in a row which screw you over.
There's lots of rooms to grow here! Adding equipment that provides modifiers to your dice, or player levels, or having supporting actions that are only possible on low rolls, could provide an interesting twist and provide not only a playthrough but also the game itself of more longevity. Having a mechanic where killing an enemy improves your dice rolls for the next turn, for example...
I think the dice UI is nice, but could be improved further. In my opinion, the layout could be improved to make dragging more intuitive, such as placing the dice in a row under the actions, or above, or...., but having them in a different orientation in a different place could definitely be improved. Making it more obvious that the dice are actionable might be a nice touch as well, they're currently pretty flat. But that's super nitpicking xD. Having a horizontal placement also improves the extendibility of the number of dice you could place there.
Would love the play the post-jam version you guys are planning to work on!