Pretty interesting entry compared to what I usually see. I know you were going for the board game feel and you've nailed it. I think the tutorial might need some work to tell the player more about the significance of certain card effects and how they go along with your strategies for getting through a dungeon (one example would be the bought cards going into discard and iirc there are cards that allow you to discard your deck so you can access them faster). That's up to you how much handholding you want to do, though, I guess. I was able to start getting the hang of the game pretty quickly; felt things were fairly intuitive.
The major gripe obviously is the programmer art. The game seems really solid so far so I think once you get some better art, UI, and *gas* in there (SFX, VFX, and movement for card effects) things will come together quite quickly.
がんばって！