Wow, I really liked this game! The music too. I was getting really excited to get to the overworld, so I was a bit disappointed to see that this is where the game currently ends. :(
I hope to continue playing it someday, when it is finished. Also, there are a few annoying bugs: At the start of every fight I get the "No more mana" text and I need to actually run out of mana to make it go away (maybe it's because I skipped the intro, as I have played this game once before the jam finished) and the boss' music continues playing after beating it... also, the password thing could've maybe had a better design (show if the password is wrong, retry, ... and to not make it scrollable). I also think it would be really fun if those face cards (Ace, queen, ...) could be stacked, so one multiplies another one and that the next one and so on.
But overall, I think this game really has potential to be made into a real good one!