Another user known as Nexturne, showed of his progress of trying to make a bullet hell here: Create a Bullet Hell
I have an idea for a possible object type that could make creating bullet hells ALOT easier. What if like the particle emitter, there was a bullet hell emitter? You could be able to set the spray cone angle for the bullets? You could also set how many are fired at a time, if bullets run in a pattern (Ex: 3 red bullets for the first row, 5 blue bullets next row), and if the spray cone rotates around an objects point. You could also set is so each row follows a sine movement, and if some bullets rotate in a group. And yes, you have to set the bullet object.
I think a bullet hell emitter could be a GREAT addition to Gdevelop. What do you guys think?