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steam is oddly strict about not including anything besides the game's literal steam title in your artwork 
can't have the japanese name on the cover art unfortunately, and it looks less cool now but whatever i guess :P
@arc who knows. my game's technical full title is "God's Disdain: Kami no Keibetsu" but since the store listing is just "God's Disdain" i guess they didn't want the rest of it in the images?? idk man.
@beardalaxy That sounds stupid, I can think of a few that don't follow that rule, like Nioh, or games with long taglines or something...