This was fun!
It'd be nice if you can cancel all the way out of the shop instead of needing to go down to leave.
I did have a bad habit at first of accidentally picking up my items instead of using them, but I eventually got it sorted out. Also, if there was a trash can for fish or something instead of one button destroy, that might be nice. Again, I kept using the wrong buttons. Maybe because they are presented X / [ ] but on keyboard it's kind of backwards from that?