Damn, honestly sounds like farmers aren't really worth it in this game then, much easier to just kill pigs in the woods or just farm yourself.
Not worth it for food to eat. You're better off served with meat from bear traps or milk from cows tended to by NPCs on livestock duty.
Very much worth it though for raid food (for buffs) like the Veggie Pizza, ingredients for certain potions/medicines and materials for the odd building or accessory.
where do you get katana? i've been beating lv 5 and all i got were wand and shield....
I believe it crafted via an Elder Brother.
Where you capture an Old Man Native, then give him a rejuvenation potions so that he transforms into an Elder Brother.
Uh, katanas can only be gotten as a possible boss chest loot on Dungeon Level 5 (with the Golem boss). Elder Brother Native has nothing to do with it and can only craft a Battleax.
It's random though and might take quite a few tries. It's recommend to reset Level 5 and use a Drone to scout the level quickly. As a side benefit, you can farm quite a few Cores this way too.
Some other tricks for the dungeon include plonking down a flag on 1F and fast traveling to it. This teleports you to the next floor each time. (It will send you to the void if you do it on 10F but you can just drop off and fall on the surface of the island). You can also bring along a Kodachi (craft from the Spring Workbench) since its heavy attack lets you teleport through walls if there is an enemy in range (5m or 2 platforms).