Thanks for the follow-up. The logs should be in "AppData\LocalLow\kemomic\Illusive Domain" that you can get to from running %APPDATA%.
Ideally, I'd like the player to be able to just jump straight into the action, similarly to how Furi starts off with a boss. In practice, there's too many mechanics that trying to cram it into a tutorial boss in previous builds just made for a boring boss and a bad tutorial, so the current tutorial is an attempt at shortening it as much as possible.
The jacket is removed during the cutscene, and it should be reset if the fight restarts.
I think ~1h is a pretty good time, especially if you haven't played similar games. I'm at around 6-7min myself, but my other friends took 30min and 1h respectively to clear it.