Fun, and the card ideas are neat, but the balance is kinda a problem. Stilettos kill every enemy in the game in one round without any problems if you have 10 of them. I balanced card draw and mana to keep a short sword and scatter in the deck too just in case, but even the Black Knight just has health and no damage reduction or retaliation or anything.
You can go below 10 cards because food so you could even make an infinite combo of stilettos with just the ones you start with if you can get enough food to pad out the rest of your deck for one batttle.
Other than that, the biggest problems I ran into were:
1) no scrollbars. I assume this was a time concern because Game Jam, but it was still annoying. To edit your deck you have to add your collection to it except the cards you want to add, then remove your deck except any cards you want to get rid of, then memorize what card you are at, then move your collection back from the deck to the collection area, then move the top cards into your deck until you reach the cut-off point. Also Archmages have so much stuff without scrollbars, you maybe can't see the last cards they have for sale.
2) no ending screen. Again, probably a time constraint. Annoying to beat the Black Knight and then just be stuck in a glitched state, though.
3) You can't buy the reaper scythe from the reaper shop. Not sure why.