The game looks good. To be honest I was thinking that the art is was made using IA, your artist is good !
I must say, I don't think it a good idea to have a lot of things to read for a jam game. It take times, and we want to test a maximum of game for the time we have.
I did not totally understand the final battle, there is a lot of rounds and it go very quickly. I think you must do the action one by one (for understanding) and offer an option to speed up. Some simple tweening animation would be great for a minimum of investment.
The mood of the game is great. Some 2D light and particles for the fire would help the mood, etc....
Overall, great work.