Very cool! Super fun idea.
I had some problems with the cards at the beginning, it was kinda glitch some times, but not a huge problem. Sometimes the card just didn't work on the dungeon at the first time I drag it, but not a big problem too, since I could just try dragging again (don't know why this was happening).
It was kinda frustrating fighting the Skeletons in the combat rooms. I always tried to dodge their attacks, but seems it to be undodgeable.
Other thing that I think would be great is to have give more cards to the player, lets say at least one per turn. I had to lose one action just to get a card per turn. One of the things that make card games fun is that the player have a good amount of options in its hand to choose one, so I guess it's is definitively a good idea to increase the player cards somehow.