Good idea here,
Didn't really get the idea of cards wich you chose wizard or ranger for example, maybe i didn't play mych to see what it really do,
It seems the IA is really easy to kill, i don't know how much time it take but i know it's a lot to make a really good IA so it's not really a bad point for me.
I've got some things to say about the sound since i see you did the sound of your game,
Your music doesn't loop well, intro, card selection or combat,
With a very repetitive theme for the fight (maybe i didn't play much to hear an other fight music)
Be careful with click in the sound (i don't know if it's the good word for this in english)
Your sound for the dialogue create a lot of click, maybe if you allow a little fade-in/fade-out it can clear this problem.
Good concept, i think a post-jam could be cool.