So sadly, Harvest Moon really can't join.
Yes they can. Who cares if they're nintendo or not? They're nintendo enough lol. See strategy wiki joined. Nintendo-ness is something we really need to work on. We have decided that eventually there will be some foundation with grounds to add any independent wiki. But not now..
I am still of the opinion each wiki should join an IWA that is based around the company principly responsible for them. If we allow any wiki in, we risk becoming too big and bureaucratic.
Edit: I just realized i could of said that better. This is what i meant:
I think each wiki should join an IWA that mostly closely related to it. This way, if you want something Square Enix, you go to the Square Enix Portal; You want something Rare(ware), you go to the Rare IWA; and so on. It's a marketing strategy more than anything.