Good luck to everyone participating in the jam - I know your games are going to be great! I own Filebase, an Unity asset library filled with 2,800+ Unity Asset Bundles that our artists have put together for the past 4 years. We cover everything - modular environment, props, characters, monsters, ships, cars, tanks, everything! It is mostly 3D but you can get an idea of what the style is and what we cover if you hop on our site and click the search button.
We would love to give you guys access to our library for free for 1 month to help you with your jam. We have tons of game assets that fit this theme so I hope you guys can use it. These assets are only for Unity though - just a heads up!
Use this promo code to get access: JAMWITHFILEBASE
Have fun and best of luck!