I was a bit lost for a game or two, but after that the system really comes together and starts to make sense. For a simple game, I found it really fun and all the more impressive for exactly how much was created from scratch. The card art was awesome, and perhaps my favorite part. The built-from-the-ground card plugin was impressive in its conception, but as one would expect, lacking a few of the bells and whistles due to time.
My biggest issue with the card system is the instant and unsatisfying way that turns would resolve. Seeing cards disappear and appear on the field each turn with no satisfying attacking or defending animation or movement made the combat feel a bit flatter, and the lack of feedback on damage made it harder to understand just by playing. Something as simple as a shake, flash, tiny color change would have gone a long way in improving the overall feel of combat.
Building decks could have been improved with some simple descriptions of the cards' stats in the menu. Having to play the cards to see their stats made it a bit less cool getting them, and I put way too many weak rabble cards in because of this.
Story and theme were appropriately bleak. I got the feel of general despair and nihilism. Felt like a fantasy combo of medieval fantasy and Lovecraft horror, so I think that worked for sure.
I'd be excited to see more card game improvements in the future. Maybe another jam entry one day in which the system is extended and improved? Would be a pretty awesome mini-game, or even main mechanic in a lot of projects out there.