Solid game, after 2 tries I'd fully got the hang of it and had a super long run, I don't know how many rooms you have to go through to find the boss, but I must have been through at least 15-20 and then it black screened when I went to enter a card room sadly.
The card battler combat is fun, sometimes the minigames felt a bit hard with the rng such as if the doors with the swords open in a certain order then it seems like you just die, the hitbox on the swords is massive so I don't think you can walk back through a sword as it goes in when the next door along is about to open, or at least in the 2 times i tried i never managed to.
I think there's a bug with the non-combat rooms, they are completely black and there's just the text boxes at the bottom (and cards in the middle for card rooms), luckily I was able to progress without issue despite this as it was just the environment.
I think what would massively improve the experience in the game is some audio, with card battlers it always feels really nice to have some nice *fwip* *pow! pow!* when you play like a double hit card.