Fun, polished, perhaps a little too easy. I’m no expert at card battlers so it’s hard to comment on balance, but clearing the first floor on my first clueless attempt didn’t leave me with much of a feeling of accomplishment. Think Slay the Spire: I think it took 2 or 3 runs before I beat the first boss.
One thing that I think is missing is some sort of visual of your opponent. Would add to the sense of progression to go from smashing lowly thugs/slimes/rats, to demonic chaos gods or whatever. Even if you just show a portrait before the battle.
Could see myself getting addicted to this!