I wish there was a way for the player to release the charge early taking out a smaller group of enemies but clearing the way for the player to push forward.
I have beginnings of that exact system in the game jam version, it's just not active, though i was thinking about it :D
you could also add a variety of different bullets with different properties that allow the player to get more charge but more difficult to catch or even reduce charge that moves at a slower rate giving the player the chance to avoid it.
I had some enemies planned too but i had to cut scope to finish, same with bullet types :D
That being said, ill check it out in my free time, cheers :)