All I gotta say is, wow! I can't believe you had the time, and even in this little amount of time, made a game this polished and thorough! Before going to bed, I was able to beat two of the bosses and picked up on the game mechanics really quickly! The combat was cool, although I don't really get the damage/health thing and how the battles were entirely handled, but what I did know was that big number damage good!
Some critiques that I have for the game to make it fully fledged out:
Longer soundtrack - The music was really good, but the loop was short and there was only one song that played when I was playing the game, however I did only play for about 30 minutes (as class is in the morning),
Readable Text - I saw that we were able to zoom in on the cards, but having the text either in a different font or more legible would be nicer
Overall, I think that this is an awesome game and will be looking forward to more updates!