It's probably too late to implement some of these assets in your game for this game jam but! It's always good to get assets that you'll end up purchasing anyway at a discount.
Main Sale
https://assetstore.unity.com/?on_sale=true&orderBy=1&rows=96&aid=1101lpybK
Daily deals (70% OFF)
https://assetstore.unity.com/?flashdeals=true&aid=1101lpybK
These are affiliate links and help us out a ton!
GLHF!