I enjoyed this overall. The shopping as a combat mechanic is interesting. I would have liked the items to have descriptions. Other suggestions for improvement would be being able to attack in all directions, some type of map, and some more sound effects. I would also add a little more visual and audio feedback when Navi is touching those sprites (or whatever they are). It wasn't obvious that that was accomplishing anything important. Boss fights were fun, although it was easy to neuter them by trapping them around rocks. For a game jam though this was well done.