Brought up...

Feud Wild West Tactics

.. earlier in the thread...

but this gameplay sold me: https://www.youtube.com/watch?v=74xoiSp3uYI

Like the turn-based gameplay and even the basic duel mechanic. Although talk is that the story isn't going to win any awards... and the battles are long. Still, sad to see it isn't here (only on Steam at present).

Found another interesting Western that I'd never heard of...

WESTSLINGERS...

Real-time squad-based strategy.

trailer: https://www.youtube.com/watch?v=-ZeMKa0Hq2U&feature=emb_logo

gameplay: https://www.youtube.com/watch?v=u2fkNHJzrd4

Here's an old (2001) RTS that I'd love to see on GOG...

AMERICA: NO PEACE BEYOND THE LINE

GOG wishlist: https://www.gog.com/wishlist/games/america_no_peace_beyond_the_line

gameplay (Native American): https://www.youtube.com/watch?v=4am1b522ar0

gameplay (Mexican campaign): https://www.youtube.com/watch?v=ZdyBXM1ITKw

gameplay (Outlaws): https://www.youtube.com/watch?v=wyg2WsV-i6M

Found some fun-looking (and generally well-reviewed) Wild West shooters that IMO looked and sounded fantastic!

DEAD MAN'S HAND

by Human Head Studios (RUNE, PREY)

game review: https://www.youtube.com/watch?v=AJ8N66mJJOQ

GUNFIGHTER II : REVENGE OF JESSE JAMES

by Rebellion (Sniper Elite series)

gameplay: https://www.youtube.com/watch?v=gUGMBFmNp2s&t=443s

Found a Wild West city-builder that would be cool to see here on GOG...

DEPRAVED

trailer: https://www.youtube.com/watch?v=ZDalSKlAtL4

gameplay: https://www.youtube.com/watch?v=q8l4BK_gCfY