The idea of dungeon crawling with cards and card duelists along the way is interesting.
Expanding your deck with a "gift card room" is nice and mixing it so you can have new, and more powerful cards is awesome. I did understand the use of coins to play but never used coins in the outside combat stance, as I thought it was better to keep them.
The general art style of 2d pixels in 3d is style super awesome, and I would like to see the card a little more "artistic" Idk if you understand what I'm trying to say... for now they are nice but too simple compared to their surroundings.
Anyway, I really like the atmosphere and general look of it, GG!