I know you said this was more gameplay focussed on Twitter but even so the lack of dialogue is definitely felt. At least from what I've played so far. You basically have 20 days to prepare for the boss rush with not a whole lot of ways to talk or interact with Slim other than tastetesting. It kinda feels like you have to figure it all out yourself with no real direction. Which is fine if that was the point. But having no real way to interact with Slim prior to the town protection events really hurts since you can't exactly level her up prior to the swarms. Which means those 7 points is all she's got. Maybe I'm just dumb though and not really thinking enough outside the box?
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She can be leveled up in normal battles if you complete the first two taste testing practices with her!
Though, it's easier said then done, haha.
Each day, talking to Deko in the forest during the 'morning' time slot earns a bit of cash early on to perhaps scout Slimjarg earlier. More so if you upgrade Deko a bit with common weapons.