I liked the music, and it suited the game well. The game was also a nice length and didn't overstay its welcome.
I was impressed by how many features you managed to include for a card game in such a short time. One thing that could be fun to explore in the future is letting players combine two cards together to create new effects.
Overall, I had a good time playing it.
I would recommend, is to sort the enemies by how close they are to the bottom, I could not see the enemies number of the one closer to me which was more urgent.