I think the atmosphere and art is cool! Good stuff. I think your loop is a little confusing, I didn't realized I needed to click the shop to go and spend my gold I thought I needed to complete some kind of combat loop before doing so. So maybe adding some kind of "end" to each piece. Kill a monster or two then you go to a shop. Also going to shop just full heals you which is a bit weird? Got my guy up by just adding into attack and two shotting everything then going to the shop and backing out. Think you have some bones here with the mechanics there. But you probably want to define an actual loop and progression system.
Good job!.