Congratulations on your first ever game jam! My recommendations are similar to Fryvan's. Generally speaking, you want to make sure and add some kind of basic sound effects and music to the game, and some kind of win condition. But this is what game jams are for. You learn how to quickly prototype and if it doesn't turn out great, you can always forget about the idea after the jam and start anew next time. Good luck on your future games!