Unfortunately I feel like there is no need for me to use the ball character.
I'm not entirely sure if you forgot to remove the 'Ctrl' mechanic where you shoot extremely fast, but even without that mechanic the boss dies too fast, he has time for around 1 attack total, I feel like the boss should be more tanky.
I think that the boss being more "bossy" and giving a need to the ball character would be a nice thing to change!
I also fell under the ground with the ball guy.
Great game though!