My impression for this demo is that it focuses down mainly on the shop system, especially the old vs new UI so that's mainly what I'll be focusing on, though in general the idea of a Wild West-ish Recettear is a good one, the art is charming and being able to put the hat on is a nice touch.
Using keyboard and mouse, personally I prefer the interface where you scroll the cost instead of the one with the scale, but mostly because it lets me accurately put in the cost that I have in mind instead of having to try to find it in what's essentially is a scroll bar, thoguh I can see why someone might prefer the scale version. My only issue with the barter system is that I wish it had a dedicated UI button for proposing the price, as I accidentally clicked over the deal a good amount of times trying to go past the dialogue. Would be nice if they offered an alternative price if they don't agree with yours and don't storm off immediately.
Having to sweep as the dirt accumulate is an interesting idea, though I'm wondering if it'll end up too much of a chore once more things are added to the game. The footprints and the dirt was way too distracting for me with how much they are highlighted, making me actively go out and sweep them up even as people were waiting at the register. Maybe toning it down to just it being a visual thing that people can do it just for the satisfaction of seeing the shop clean without any gameplay element tied ot it? The sweeping animation also feels like it has too long pauses between sweeps, I wasn't sure if sweeping happening at first because the character stood still for a long moment before starting to move the broom.
The music is nice, having varios versions fade in and out as you play is a nice touch, though with that being the only track it can become a bit repetative - though that's also partly the small scope of the demo.