You know for a first jam game it ain't that bad! I think what lacks here is the essence of polish. For your future jams, a tip I could share would be that to invest 20% of the jam into making your game game and put 80% into what you want that game to be. Something as simple as a fireball can work wonders if you took a day programming it and the next 6 days just making it the most amazing fireball ever.
Good Luck with your future jams and that I hope to see you guys improve in the future!