I really enjoy getting into the meat of a game and doing playtesting/balancing. Going to give this a run in the next few days and see what's what. Are you doing some more lore alongside the game (haven't poked around in the blog yet to see if you answered this question)?
The lore mostly comes in the form of flavor text on cards or in the instructions. I want the lore to mostly come in cryptic bursts that fire the imagination of the players, and give suggestions as to the larger picture of things. I especially try to be hazy on the exact details of each faction's religious views, so players can interpret what they believe however they like. I have a lot of ideas on what some cards should be, but I give myself enough room to improvise in case I see some amazing piece of art that fits a card in a new way I never considered. That was half the theme of my most recent post, where I described how the nature of some cards changed based on the art I found. For instance, there's a race called The Cracked, which were meant to be a completely bonkers race (and the placeholder art I originally used was a photo of a guy in a straightjacket in a padded cell with a gag in his mouth). But I changed it to a kind of android instead, because of the final art I found, and it struck me in a particular way and made me think of taking The Cracked in that direction. I have also been considering writing tie-in stories that go along with the game, though I want to probably get at least the base game complete before I start those. Also, when this base set is complete and I begin work on the expansion sets, I might try to push a narrative flow through them so there's a bigger overarching story that progresses (and might even change how the game is played as it goes on). As for playtesting: super apologies in advance! You'll be doing a lot of printing and cutting! :p
Got any updates on playtesting? If you have, no need to be gentle about critiques; I'm not completely in love with the mechanics or anything, so I'm definitely looking to fix what's broken or boring.