Thanks for playing!
The barrel section is kind of an easter egg/hidden area for later, I just kept it in as a little secret because the rocks happened to leave that small opening. The floor collision has been fixed recently, too.
For camera easing, it's hard to find a balance because it needs to be responsive enough to keep up with some of the other enemies. Locked camera also has to offset itself a little to frame things from a slight angle so that you don't fully cover the enemy, but I also haven't considered the part of having it be dead centered too.
The story kind of is just that, and there isn't much else you need to know beyond the few mandatory conversations if all you want to do is to fight.
Unfortunately, regular non-bosses are part of the game's "will not do" list, because each boss is supposed to ask something a little different of the player to quickly build them up to the point where I can throw even crazier stuff out there and expect them to deal with it. At most, I might do more in-depth ability-focused tutorials/training mode in future, because even the fox can be done in under 2 minutes if you understand how to maximize your damage with the skills.

Animations broke in the middle of the 1v4. I've seen this happen before in my own games when I update the animation clip and reimport it while the game is running (with custom playable graphs), never happened in a build for me though. 