The colors, background and overall look of the game lends itself to the theme and aesthetic very well. It also hit home because goodness, I feel this game so much.
When I looked at the shopping list, I thought to myself "with this budget you couldn't really get all of this" and this made me think: how about the player has to choose which items to take and which items to leave? Cave in and take the comfort food (chips)? Or opt for a healthier alternative? When shopping on a budget one is also always on the hunt for sales, so that could also be a mechanic perhaps?
Overall I love the concept, well done! :3