Hey guys, if you're struggling with this jam especially with so much time in it, the best advice I can give is just to make it first.
Ignore art, ignore sound, ignore anything that isn't the game. Make the game and make it feel good. If it feels really good and fun when everything is a bunch of coloured cubes then you can move on to the stressful stuff! It's also helpful to get your ideas out there! So I wanna hear your ideas for your games!
Best of luck everyone!