Well done for your for your first game jam in such a short time!  I love the sprites for the characters, theres alot of variety in them and a surprising number of environments.  I like the idea of collecting a bunch of different weapons, but I definitely feel like they could have had more differences in play style, for instance the starting weapon felt stronger than the spear.  The pirate zone I think stood out the most, it introduced ranged enemies, had a new type of terrain (water blocked movement but not shooting which was a nice change of strategy) and the boss had a nice set of new challenges.  I did have a few bugs, mostly related to switching weapons, such as having no weapon equipped when entering a new floor, but nothing game breaking.  I really like the style though, especially the main character :D!