Congratulations on release! I always loved the "western"-themed setting after influence from my favorite anime, Trigun.
My best and only suggestion is to use that difference in themes to your full advantage. This setting is a time before law enforcement, modern technology, etc. was developed. Installing systems like putting a Bounty on someone's head, feeding and taking care of horses at your Stable, player-owned shops such as Saloons, mining for minerals/panning for gold, and traveling through railroad trains can all be unique characteristics that sets Ol'West apart from iEra.
Main point is, there are lots of awesome ideas to implement to this theme- I hope you guys plan on taking full advantage of it!