Thanks for taking the time to play it, even though sucking at bullet hells!
Not everyone can be a master of VFX, as yourself, so I'll definitely take the advice on the charge attack to heart for future games.
The dash is not perfect, true, but there is some depth to it if you take your time to experiment with it. I know it a big ask for most players, but it is what it is.
You won't get a difficulty select, but probably a bullet amount slider, so you can have a dynamic multiplier applied to the amount of bullets spawned (0.5-2.0)