Well, I don't think it's supposed to become a "sandbox" (You won't be able to decide what your character should do whenever you want, you're only supposed to make choices like a Visual Novel, so I don't think the shop will be ever really implemented since it wouldn't have any meaning).
But, well, even the choice aren't meaningfull as of now (There's only one choice near the end of the content that currently lock some option for a choice coming after, but I don't think that change anything beside the scene you're viewing, at least for now...
)