Cute game but there's not a lot to comment on at the moment.
The new UI is faster and more convenient for setting a markup, although I'm not sure why it moves 2% when you press once.
I couldn't replicate it but once I was trying to sell something at a price so egregious that when the next costumer's dialogue started he immediately said "I won't forget this" and stormed off, this was with the old UI.
Controls-wise, personally I'd let the player set the markup without having to read or skip the dialogue first, and I'd let the player walk with the d-pad.
It's not bad for this stage, but gameplay isn't super interesting at the moment