Some suggestion:
1- Let the town a little richer! Put more houses, more terrain, more people, other shops. Let us actually feel like in a town. And fix the skie's realism, the night just chance the sky, but the sun stills there like mid day.
2- Put some more complicated request, maybe a client enter, ask for something like 3 greatswords at least of iron, and he comes back in 2 days to get it.
3- Put more diversity on the weapons, put some armor option, add an use to the wood logs! Put secret paterns, unlocked with level, that make the weapons more expensive.
4- Put carpentry too! It would me really great. Maybe you can choose if you to be an carpenter, or an blacksmith, or both!
5- Make harder to get new ingots, make the progression harder! Its too easy, In 1-2 hours you can go copper to Titanium. And make craftable ingots, maybe with a melting cauldron. The prices could something like: 10, 200, 500, 2000, 15000, 100000.
6- Put a Temper System, basically is: the more you heat, and abruply cold a metal, the more resistence it will be, and you can make it more expensive
7- Add more grip and guard Styles, more option, maybe not just buying, but crafting it.
8- I really like the graphics of this game, but I think that the caracters design is too much poor. Make them prettier, and with more context, and with more of them. You can also put a description, and their order can be something like a quest, you recive it, and they tell you why they need it, who they are. And another suggestion, a little more of graphic realism would be great.
9- Employees would be really great
10- Relocation, buying new bigger places.
11- Options of buying new better furnaces, anvils, workin' tables.
12- If you haven't yet assume a medieval thematic, you can allow the creation of a factory!
Okey, now just a note: Sugestions 1 to half 8 and 11 are really important for me. Everything that is not that, are some fantasy kind suggestions, maybe too out of the box. IDK if you are doin' this all alone, but if you are, just focus on the ones that i mentioned.