Ah yes the grammatical errors... I need to go and read all the dialog again to catch all the mistakes. Its something on the "to-do" list for quite some time. Same thing with the grapple freaking out sometimes. I can't seem to replicate that glitch but I am hunting for a solution.
For the projectile attacks, parrying the multi-projectile version is supposed to be a high level tactic. The projectiles are slow enough that you can just run past them and still hit the boss with your weapon. Oh and also with the Volley. Whats happening is that you are so close to the boss that he parries and you instantly parry back because you are still in a parry state in the ripost animation. It wasn't intentional but I think its a cool way to speed up the fight.
I will check out the doors and... wait Willstash gives you another gun?!?! I thought I fixed that already. Thank you so much! Without playtesters like you I would probably never catch something like this!