I think the character art for the third character bugged out so couldn't see what they looked like but yeaa the art is quite nice and you have made each character story quite specific and unique to them, so that's pretty nice too. The only thing that felt missing was knowing the consequence, like if the letter was written badly and miscommunicated something then the character would come back to tell us about that. Or maybe just the part where they tell how it went. Just some food for thought if you pursue this further. It's still quite a nice game.