Never got past level 6...
Very good card game, reminds me of the one in Might and Magic 8. You also did a good job on debugging it; the only error I found was if you use Gelid Touch (paralyze enemy) and he uses a Metal Shield or something that affects him, it still takes effect. I liked the different animations you used for attacking, transforming, poison, heal, and such. I have three suggestions to make a good game better.
First, get rid of the f*cking burp sound.
Second, tweak the card probabilities. I don't want 3 "Dispel - Self" cards, and the enemy always has a "Regeneration" card handy when it's available. He also seems to ALWAYS have more rune cards than you do at level 6. Levels are won more often by luck than by skill.
Third, delete every instance of the enemy talking, and replace them with "Ouch!", "Aaarrgh!", "Hyah!", or even "Cure!" Some bad examples:
"You are beginning to get me angry!"
"You will regret of your insolence!"
"UOOOOOOH! The facestrange receives more than a fool!"
"Don't think that hurts?! hehe, what a facestrange you are!"
"I hope you have something better than this, muhahahahaha"
"...but you won't arrive too far."