Neat RPG. The steal mechanic is doesn't really fit the the theme(then again, all rpg protagonists are kleptomaniacs out of control so maybe it does). The abilities do get broken though.
I think it'd work better if the abilities had use limits and the steal was usaable in battle as well. IIRC Disgaea let you steal enemies stats when you fight them. Perhaps you can make it so that the abilities can be used finite amount of times after getting them and you need to constantly steal to replenish your moves.
Art is gorgeous and you have a lot of content for a gamejam RPG.
Really good job!