Hey! I think a full version of this game would be pretty cool.
One thing I think could be improved is the smartphone. Now, this is just my opinion, but I think putting UI in a gadget/phone is cute, but something about it feels a bit uncomfortable to me. Not sure how this could be improved, but just putting it out there.
Since making jam and putting it on different dishes is the thing you'll be doing most, I think it would be a cool idea to put some little challenge into actually making the food. Something like pressing a button at the right time in order to stir it to make it better (or something like that). Even though this is supposed to be a nice, relaxing game, I think putting something more into the core mechanics to engage players would be awesome!