You would think that that would be a little extra but Graal does have a few mis wordings...

For example, the Flute sold at the 'showtunes' shop has a description of "This magical flute has been said to have some unknown power." could that be linked to a quest?

Just some thoughts =)

Maybe you aren't jumping in the right spot? You have to jump down the hole in the shop.
It doesn't have much either way, looks like recolors of other stuff
https://i.imgur.com/13DvINB.png

Uh how do I get there?

w h a t h o l e

he probably took a screenshot and went in a recolored the hats.

https://i.imgur.com/DMX0gIy.png

Nah, I'm joking. Was gonna tell you that you needed the "secret maple leaf umbrella" from the capsule machine (in order to jump down the hole), but idk how many capsules you would have bought trying to get an item that doesn't exist.

There is no 2nd shop, at the moment.

Of all the hats they've included, I would buy your non existent leafy wizard hat in the top right. You sure pulled out the stops this time...