MORE OF THIS PLEASE!!!
Let me start out by saying I was brought here by YT:@Morequis who made a video on this game. I loved CoalLLC and most all other incremental number go up style of games. I really love how your game feels and the aesthetic. I know its not super far into development but I feel that you are creating a very fun game so far. I would love to see more ores, more upgrades, different venders for different upgrades, different visual biomes for your dungeons. I liked how To The Core (a favorite of mine) did their progress where you had to visit different planets to get the specific resource u needed to progress. I would like to see the smelting part of the game be a bit less tedious, with either more upgrades or something more interesting than simply bigger stacks and faster times. Maybe more furnaces unlocked after completing some quests or it just smelts right into your storage maybe a minigame for making smelting more interesting? On the different vendors bit, Consumables? Purchased temp buffs? a pick axe upgrader (iron pickax lvl 10, 10dmg per hit. steel lvl 20 25 dmg per hit. etc...) vendor that unlocks different materials to be smelted at your furnace.
Just some of my humble ideas for you to work with.
I would absolutely pay money for your game once its more developed / completed development. I hope you list it on steam, and keep working on it! I think it shows great potential! :D