Not sure this is suitable for the Technical Discussion so I'm going to post it here. I mention Technical Discussion because this may be a bug.
I spent most of my evening trying to beat Chapter 5 "All Aboard". For an arena with such a simple premise, I had to repeatedly bang my head against it before winning and I'm still not sure how I did, maybe blind luck. I don't mind it being difficult but I should be learning from every attempt but because the order in which you get access to your characters is preset and having only limited access to your weapons it just seems like you're relying on RNG to win.
Also, and this is a bug, the AI had a habit of running into the fires, jumping up and down from the central platform, running into corners and kneeling even when the could have attacked and even killed my characters. In fact, I think that's the only reason I won in the end, the AI bugged out so much it gave me a chance.