i'm assuming we need to restrict our colors to the NES palette as well.  the rules don't mention this though.  are there any other restrictions we need to follow?  https://megacatstudios.com/blogs/retro-development/creating-nes-graphics

This is a great idea! Since we're allowing some leeway with the audio requirements, let's say it's not a firm restriction, but it's encouraged. 

But there are no other restrictions than the ones already mentioned. Thanks for asking!

I'm going to add this color palette to the game jam description though.