• I feel you shouldn't be able to add any more animal fat when the oil can is full
• Right now you can only add one animal fat to the oil can at a time. It'd be nice to either be able to add as many as possible via the crafting table, or make the oil can place-able so I can place the fat in it! (Or some other idea that helps with this)
• Perhaps if a lantern is one hand, and an oil can is in another, if you right-click in the air, you fill the lantern with oil? Maybe you could light it in-hand as well?

interesting