Nice little visual novel! I enjoyed the setting, the gorgeous art, the writing, the music, the emphasis on character relationships -- pretty much all of it :) When serving customers, I wish my choices were a bit more informed: e.g. how much they will be charged for each dish. More broadly, it would be cool to have a more of a management/simulation aspect to it: the game could keep track of the player's spending and revenue, their reputation with customers, etc. It would be nice to see what day 2, 3, etc. look like, and what are the repercussions of the player's previous interactions with the NPCs.
And, to spice it up a bit (what with it being a cooking-themed game), it would be great to have some mini-games based on the cooking process itself. These, too, can be menu-based and revolve around deciding e.g. on what ingredients to use during a shortage and how to replace things that are listed in the recipe but that are not available to the cook.
P.S. I'm also having a scaling issue in Firefox (didn't test with other browsers): unless I choose Fullscreen in the options, the right and bottom parts of the screen are cropped, and I can't see the dialogue in its entirety. Might be a RenPy issue, but worth looking into.