Happy to hear you enjoyed our game and fully played through it!
Yeah the money-goal of 400€ was picked picked rather arbitrary and pretty low, but we did not want to make the goal too hard to reach. With the day length I agree and we might tweak that in a post-jam update, we'll see. More playtesting will show what others think, in my opinion they can be a bit shorter.
About the manager: My initial plan was actually something along those lines, like the store is destroyed and the manager went missing. We left it open to interpretation in this version (mostly because of time constraints, the whole story was like a last day idea xD)