This game is great and I'm very excited for the stuff you have planned on it. I noticed you were really warm about feedback so for one I wanted to say that you have a very lively and 'lived' in game world here. All the places feel super distinct and the landmarks are incredibly amusing. I appreciate the focus on ambience over strict market grinding as well, and the comic humor really works for me :p
I have some feedback on the fishing though, it's kind of too slow for what it actually is. The ores are a 1 button click to mine and I can get 3 of them in 3 seconds. The fish though take around half a minute or more to clean out in an area, this means on a per money basis mining and trading are just the more economically studious since they are more profitable and have less risk associated. Obviously, not everything in a trading game needs to actually be economically satisfying, but I really love a satisfying fishing game with feedback. So I don't know if this is already the case but if there was a way to make the catch of rarer quality or bigger based on when how soon you hit the button, personally that alone would add incredible charm to the fishing mechanic. Otherwise this a great demo and I'm really excited to try the full game whenever it comes out.