The atmosphere of the game is very comfy. I like your music too!
I played Recettear a long time ago so I don't remember all the details but it seems like you did a good job of replicating all the basic systems from that game. I like the idea of the patience bar to add a real time element although I think it decreases too fast right now. It makes the gameplay feel hectic and the player want to just go with the default option ASAP. Also like the idea of sweeping floors as it makes perfect sense in a shopkeeping game.
Not much to say about the strategy right now since there's only 1 customer type and not many differences between the items. Once you add more content though I think the game can be a lot of fun. Do you also plan to add dungeon adventuring like Recettear?