Progress!
Got chests working today, though inventories would be shown in a better way later. Also, the hard-to-see gray frame now has a sprite.
Next up is some crafting, so that the game will finally meet the jam's theme. After that, I'll probably change the way the chest inventory overlay is positioned (ideally, it would be possible to see what is inside the chest without getting in as well as what is outside before going out). Ah, and I should probably increase the chest weight based on the contents...