Awesome track, well composed, perfect structural balance, it sounds like it come from a ragtime songbook.
And it is a good idea for a shop imo.
Even though I love the constrast that come from the part at 0:36, its maybe unjustified to have such a dark sounding moment in the shop music.
All things considered it would have been even better to turn it into some sort of revisited ragtime by adding unexepected stuff reminding of the mother universe. But as I said to someone who made a straight bossa nova, its not so easy to do such things when deep in the codes of a certain style.
Also for the sound/mixing part, I felt it was a bit robotic for a ragtime, maybe too quiet also.
A very good composition still!