Awesome work on this! The models, audio, and narrative are all incredible.
It would be nice if there was a stronger indication of when the player was attacking (e.g. some sort of particle effect), since it can be hard to tell which animation is playing with the zoomed out camera. The gameplay also got a little bit stale after a few rounds, but the intermittent fights with the demon jumping from the moon helped to mix things up.
The music is fantastic --- is it original?
Great work for a month-long jam!