Hi, I will (sadly T_T) not be participating to this jam as a jammer BUT in january I made a Godot plugin that aims at providing all and every feature you might dream of as a BulletHell dev, and I thought it might interest you. (Actually, I already know people that are going to use it for this jam :O ).
BulletHells are my favorite game genre and my main game project is one so I wanted to make the perfect plugin because I wish there was one that existed when I started my game. So if you use Godot, don't hesitate to give it a shot !

Here it is ! https://bottled-up-studio.itch.io/godot-bullethell-plugin

It comes with full documentation but it's also pretty easy to use (which was the main goal). If you have any trouble with it, come over on my Discord and I'll gladly be helping you. :D https://discord.com/invite/aWWQbgQUEP