So, after playing through Vol.II, I noticed the improvements and like my comment on Vol I, I'm just gonna go through the points that I have opinions on
-Guns: feels better than Vol I, with a bassier sound and flashier visual effect.
-levels: I see that you took more freedom on the layouts, especially the final area. The textures kinda bugged out a bit on the ship, flickering and all that. Also the second area on the ship starts beside an enemy, allowing the hitscanner enemies to take a chunk of your health away, Which I don't like.
-Enemies: You definitely reduced their damage on the hitscan attacks, which makes it easier to beat than Vol.I, also less fun since I just breezed through them. May I suggest making melee based enemies? just to mix things up
-Story: you put a bit more effort here than last time, with their integration with the gameplay, which I like
-Music: just like Vol.I in terms of quality
That's all I gotta say
Hope my opinion helps!