Bringing Greek Mythology to life as a video game is incredibly ambitious which you have handled nicely. There is a lot of information to absorb at times but then again Greek Mythology is a complex subject. I enjoyed the low encounter rates in the dungeons. All in all, the time constraints of a game jam, I am impressed you were able to create a 3 hour RPG.
I see you still have some time left for your game jam so here is a few areas where you can polish the game:
-I can walk on walls on some of the buildings in town
-I would add color to text to the important definitions or words. IE (Text: My name is \c[1]Jane\c. I am the Goddess of \c[1]Water\c. )
-I would add some background music
-Not sure if this is by design, however the normal attack does not dish out any damage to enemies.
-Have clear exit points for the interiors (Like Super Mario RPG)
-Display town names when you walk into a town.
Good job and good luck!