What a wonderful experience! Everything felt polished and flowed well and I don't really have any suggestions to make :D. I enjoyed it all the way through to the end.
The audio is really lovely. I like how each menu option has a slightly different pitch, I enjoyed scrolling down to the end of the shop's item list to hear what it would do :D. Music got a little repetitive, but was still nice.
Really nice visuals, lots of variety between areas. I like the mushrooms. Overall look was nice and consistent. Was that a particular palette? It felt almost 16-color VGAish, but obviously not quite...
(edit: oh, and enjoyed the spinner(s), you had to have some!)