It's a pretty cute game with a simple loop. The interface looks very cozy, good job. Some of the art is nice and some is very blurry and stretched heh. I like the little touches like your pouch of gold becoming visibly empty as you spend gold, that's a very nice touch!
Gameplay could use some kind of win condition. Maybe the forge has a very expensive key that will unlock a restraint that was forced upon you by someone evil, dunno x3. And so if it costs like 10k, that will give you a nice goal to work towards ^^
Some kind of extra check that prevents the same customer from appearing one after another would be nice ^^
Pretty sure the dwarden keys and runics are switched in the forge, buying one gives you the other one instead but it's not that critical
Either way, great job ^^