Off to a good start.
The interface is nice and clean, not too many bugs, and the gameplay is straightforward. This game definitely has potential. It definitely needs some indicator of just what each new shop gives you in terms of (base) income. Second, it needs per-shop upgrades. Things like advertising, display upgrades (maybe display cases, lighting, etc, depending on the kind of store). Maybe even a way to select what kind of store it is. Finally, there has to be an objective. Perhaps make a certain amount of money, or have a high score list for NG members to compete. It's also worth considering to award medals for fully upgraded shops, amount of money earned in one day, etc.
As a challenge factor, I might like to see some operating expenses. Having to balance advertising for new business against keeping the electricity running would add a touch of challenge to this otherwise very easy game.
Keep up the good work. Message me when you finish so I can check it out.