It's true that this is an in-game message, not an NPC, inscription, etc, but I believe my point is still valid. As you said, it's team Adom's call :)
As a related aside, I have also learned many English words thanks to Adom (halberd comes to mind), but two things have to be kept in mind here - first, Ancardia's a fantasy world, not a classroom - second, as a foreign language teacher myself, I believe there is a time and a place for nonstandard or so-called nonstandard language even in the classroom. A good rule of thumb for this is to leave "also corrects" (words and turns of phrase that are correct in another dialect) stand. That's the case of "anyways", which is commonly found alongside "anyway" in American English (and other flavors of English).