Are you worried about the game being bad? Don't, it doesn't need to be good! Just submit what you have, no one will judge you for not having enough time!
even if its a crappy game, just submit it. atleast you will have an experience and ideas. and also you will be a part of the brackeys game jam jam. never give up
never ever give up, especially when it comes to programming!
the worst thing you can do is give up, trust me, someone who’s been doing this for way too long now, that feeling of giving up comes right before an absolute breakthrough