I like the game design and nice graphics/sound; I think the game is tuned a little too tough though. I see in the comments someone beat it but I'm not sure how. The sword grinding taking a set amount of time means you are held up there, and 1 full knight at 3* for both seems to only be able to kill 1 rat and then they'll die in the next hit. The normal knights aren't even able to kill one before dying. I think regaining health for the knights/building or giving the player a way to regain health is necessary or just making it quicker to build.
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Thank you for the feedback! I did intend on having a station were you could spend ingots to regain health, but it wasn't ready in time. For sure i'll be rebalancing the game as soon as the jam is over, to have a more subtle curve.
If you want a tip, try putting a second iron ore in the furnace while you remove the first. This way, it should be ready to pick up as soon as you finish the first sword, allowing you to continue the loop without stopping.