Overall I really liked the jam, so I don't have any complaints or major change suggestions.
One small suggestion is to clarify on the jam page what you mean by "polishing". There was some confusion over what qualifies. Some people had a more strict interpretation meaning only bug fixes and very minor changes, whereas I would have prefered a more open interpreation meaning you could add some things like sound effects, particle effects, UI art, difficulty balancing, etc. Either way some guidance would help.