Aw sick man, yeah that bullet hell repo definitely saved us a lot of time from developing a new system from scratch haha. I would have loved to develop my own system for it as well but for this jam i think it serves its purpose nicely.
And one of the cons of using someone's else system is that it can be pretty hard to understand how to tweak their own codes to work in your favors as well. Definitely a challenge to control how you want your projectiles to behave during the gameplay.