Okay before I say anything else, I've run into a pretty serious bug. After being alive for a while, enemy/character death animations stop playing, exp capsules stop appearing, and in particular, the guy with the silver hairs' bullets stop spawning altogether. The only other time I've seen this happen is when the projectile spawning slots have been 'used up', and further testing showed that the Heavy Arm is the cause of it. If I never shoot, then silver haired guy (from here on SHG) is able to keep shooting forever, but if I shoot a bunch before reaching him, he's unable to fire anything right from the start. However, the Heavy Arm keeps working, so it's a bit confusing. With my minimal hacking knowledge I would guess that the Heavy Arm's projectiles aren't being despawned properly, and so take up entity spawn slots even after they disappear.
On that note, SHG also has waaaaaay too much HP. In fact it's impossible not to run into this problem when fighting him (for me at least). I'll continue on past it for now as it's not really much of a fight, but if it starts messing up the gameplay too much I'll stop for tonight.
EDIT: In the Power Center, neither of the two weapons I have can activate the power blocks (I assume I'm meant to use the one that is still accidentally mislabelled as the "Fireball"). Either I'm missing something or this part doesn't work properly, so I'll leave it there for now.
EDDITIONAL BONUS: Everything else so far has been extremely good