Late to the party on this one, but I'm working through some entries I didn't get to and this one is super cool!
The art is cute and polished, love the juice on the cards and the nice animations and tweens. That effect behind the texture with the bubbles is really cool too. Love the ambient sounds. Even the main menu is cool with the camera angle looking up at the tower.
Combat is tight and really satisfying, the bombs affecting the level geometry is a nice touch. Tactically it provides some interesting opportunities to try position enemies to best use some of the weapons and their abilities. The fact that you need to kind of pick up and throw the card onto the field is just a super satisfying physical control.
I can see why this entry was rated so high, it's nearly production ready and probably the most mechanically fun and satisfying game I've played so far.
Super awesome job.
The only thing I would have liked, and this is just personal preference and not like a bug or issue or anything, is that the turn system had a bit of leeway so I could move in front of an enemy without them hitting me instantly (Or be able to "wait" a turn). The way it is now means that if I want to use a melee card I had to tank the damage before I can use the card, it would have been nice to be able to time the turns so I could get in there and hit first and then they took their turn.