Hey Dasius,
I feel like the currency system needs balancing. Higher quality metals should yield a higher profit as right now the weapons they make barely pay for themselves. An Iron PoleArm costs a minimum of $310 to make and sells for $330, making a $20 profit. Bronze PoleArms cost a minimum of $20 and sell for $40, also resulting in a $20 profit. It just doesn't feel worth it to use higher quality metal when I can just crank out tons of bronze weapons instead.
With this in mind, in order to balance the higher profit you could make the crafting times longer for more expensive ingots. Maybe more hammer strikes on the anvil until the weapon is forged (which would make the strength stat more useful) or maybe longer smelting times and add a stat to quicken it as you level up.
All in all I think this is an great start to an incredible game and I can't wait to see what it becomes.
Cheers