I'm a fan of your progress and the idea of the game.
I really hope there will be a finished game on steam and im looking forward to support.
My suggestion would be:
Hire Adventures/Friendship System/ Just kindly gifts for the player
With that said i mean: It would be nice if the Costumers would have names and you could slightly interact with them. Asking them what there adventure is, for what they need the weapon and suggest them other Blades/axes or try to sell them a shield.
For Example a Costumer comes in and says :"Blacksmith make me a copper one-haneded axe please" --> You say/ask "Sure no problem, what's to use for if i may ask" -> he could say something like "thats on of your business" or could say --> "there is a bandit camp i need to raid" --> your response would be(if you have other tiers of ore unlocked) -> "maybe you need something better than copper for that? May i interest you [insert ore here]" or "Many bandits require good protection! May i interest you in a [insert shield type] ? " -> and they would be interested or not.
The reason for it is, costuemrs just rarely buy shields in my shop. im on Day 10 yet and noone even bought a polearm weapon. With that implemented the Player could sell the typ of weapon thats left.
Hire Adventurer/Kindly player gifts
A nice little idea would be, that you sell weapons/shields to costumers and the next few days you receive a mail with letter that says something like "Hey Blacksmith! I am [Name] and i just bought a two-handed copper sword a dew days ago, remember me? Anyways.. i completed my adventure and your Sword just did it's job perfect. I was able to clean it with ease. After looting i just found [Ores/Ingots/logs/a Grip/and so on..]. I thought it would interest you. You will reveice the gift in your garden!" --> there could be a little area were costumers can place there gifts in tiny boxes, when opening the boxes would disappear and only the gift is left like 2 copper ingots, 3 copper ores, 1 log ....
And what i really would love to see would be: repairing weapons and shield
i bet im not the first one with this diea, so i think i dont need to go into depth in this one.
so the short version is like -> Costumer comes --> One-hand weapon broke --> and the way to repair it can be different.. my idea would be that you need to remove the blade of the weapon -> smith a new one and replace it with the old blade.
EDIT: --> also sharpen the blades would be nice