Hello, I'm so sorry for the...awfully late response, I honestly forgot to check this site due to the lack of activity/feedback, generally now I'm giving most to my attention to Steam, I am taking notes though and piling them up though it's difficult to tell if I'll be able to fix all of these for next update.
Memorimo is getting a few major changes because she's just too weak compared to the rest even if her kit worked well, that is why I haven't touched her yet, hopefully I'll balance her for this week's update.
Xera is undefeatable, if you cross her during your story mission, she's there to play her role in it, if players venture too deep and find her before that story event, she will just kill them. I'm surprised to hear Kyvzaki can handle her though being close range. I'm thinking about closing the 7N block entirely unless the player reached the story requirements for it as it really serves no purpose at the moment, but I'll have to think how this carefully, I want the players to be able to free roam in the city.
About Arris' movement, it's gonna be just WASD until I implement a proper key customization system.
The boost key is supposed to boost your movement while moving, you could move with the boost before due to a bug, it does need some adjustments however, maps 0 to 7N work under an old battle system which is what's causing most of these bugs, once I replace them with the system used in the West and East maps everything will feel better.
Again sorry for the late answer and I appreciate the time you take to classify all those things, some bugs I was aware of, others not, this week's update brings new content for the most part but I'll probably need to dedicate the whole update after this one to sweeping bugs.
I post about the upcoming updates on my Twitter and I keep a thread for my current development task on Steam's community hub here.
Thanks a lot.