So I want to start by saying the game is great, but here comes some more detailed feedback if you don't mind:
Theme: It fits the theme really well, I think that the fact the theme is not that obvious at first is a big plus since a lot of people just went for the basic co-op game, not saying that its bad that they made a co-op game, I'm saying that this is a great way to look at stronger together
Art: Gorgeous pixel art and I really like the style of it, its really unique. One issue I have is that the text can be quite hard to read sometimes, the text from what the dice do, the text fits well but it is way to small.
Music: A simple soundtrack, it gets quite repetitive after some time but its great, it gives a nice sense of mystery which is always nice. The sound effects were simple but effective, nothing over the top so they were crisp and nice.
Fun: I think the game is really fun, though at times some enemies tend to heal after my every attack so its basically an infinite chain of "I attack-enemy heals- I attack- enemy heals", but that may also be because I have not reached really far.
Game design: The first thing it reminded me is that its a combination of dicey dungeons and slay the spire, which is not necessarily bad since the game also brings its own thing to the table, and also because the art is quite different.
TL:DR
Great game with an interesting mechanic that creates a nice atmosphere wanting you to play it even more! Great job! :)