A few issues I've encountered with the new update, so that you'd know about them:
In the cheat menu, clicking on items, results in an error screen. Reloading the game fixed it for me.
I couldn't get the Jibril rematch to work, clicking on the option results in an error screen. Quitting & Reloading didn't help.
On occasion, the Kazuma head, that appears during some dialogs, has naked shoulders when I don't think it is supposed to. This includes talking to Luna in the guild after clearing the dungeon, and when we meet that new goddess in the colosseum.
Exiting the game to the main menu caused it to crash one time.
Besides these few bugs, it worked great for me, and I love the update. I especially loved the new Lolisa scene as well as the Chris H scene. The new barks are fun as well, though the labyrinth is a little though when under levelled, and the death protection is quite frustrating... Though I suppose that's by design.
This boss replay is an interesting idea, I'm looking forward to it when it'll be implemented fully. I hope you will include the fight against Rem, and the Rookie Killer. It would be awesome if you could get trophies or special rewards for being able to beat bosses that are unbeatable by design, once you are a high enough level, and even cooler, if Kazuma could get special dialogs in the dreams that acknowledges this. Maybe have the relevant companions have a dream about it?
Thank you for your efforts in making the game, and happy holidays!