Hey - this is my first game jam too, so don't feel like you're alone. The only thing I am aiming at is just releasing the game, no matter how scuffed it is - and I urge you to do the same. There are very good suggestions above, but for my first jam - I'm keeping my game simple. I wanted to do a roguelike but... I don't think my skills are quite there, and that is gonna balloon out of porportion really fast I'd imagine! So yeah, don't be afraid to release your game.