Maybe a Steampunk setting in which the technology can not surpass its limits due to some new element like 'super coal' that produces more energy, or in which clockwork technology could potentially produce automatons close to robots but still hopelessly inferior to anything that uses transistors and later microchips. There is no point in developing 'mechanical men' as they can perform only a few actions and would need to be supervised constantly as its impossible to make a mechanical mind capable of assessing a situation and then undertake the appropriate action or response (not without making it so complex that it fills a room, and even then it is limited by what the technology can handle).
So basically the Steampunk society has never developed or completely given up on the idea of mechanical men to do the majority of labor and which automatons that were produced are dumber than a roomba. (despite what could be automated, machines could never truly replace humans or even surpass them)
Even the question if a steampunk plane is possible, as in being completely steam powered and not a compromise of steampunk/diesel punk. Zeppelins would probably considered more realizable. There is of course the question of lifting gas, there would probably be helium but because there is only a limited supply of it, hydrogen gas would most likely be used more though as it is very flammable it would probably also affect the popularity of zeppelins, trains and ships still being considered safer.
So a Steampunk world that in general does not look like a pretty Victorian or Gothic world where the technology could never hope to match what civilization would produce with the internal combustion engine, transistors, microchips, and nuclear technology. There is no such thing as mechanical men, energy weapons or electrical beam weapons (though I understand that if Victorians knew of lasers they could probably make device able to generate these). Air vehicles consisting of zeppelins unless a steam powered plane is possible, and no such thing as personal seaters or jetpacks.
Haven't there been such games? I know some 'Weird Western' also feature steampunk elements like steam powered tanks.