Heya, I really appreciate your in-depth look through the game! I've been putting all your bug reports on a list of things to tackle and I'll get around to working on that soon!
On the random shooters thing, that's actually a problem I've come to agree on, especially since the next update will have a mob affiliated cahser character. I'm actually thinking of either phasing those out in favor of a different chaser character, or something else inconvenient. Right now, I'm thinking of putting a toll on the path leading to the Tower that scales based on how much you've inconvenienced the mob.
And god, yeah, I want to figure out a more practical way of changing the battle soundtrack. The way I see it, I'd have to make a custom menu (like the computer menus from Yume 2kki) to come up with something more practical.
(Also, speaking of menus "only Kyrie being able to open gachas" thing is more of a quirk of the engine. An item that's set to only by a "user" just kinda defaults to whoever is furthest down the party list.)
Also, as you're going up the Tower, I recommend going to the Docks first, assuming that you've talked to Jasper at all points.