Slitherine

Some older Slitherine games are available on Steam, and some are not. I don't see a consistent pattern.

I suppose that most of the older games (for example, Commander—Napoleon at War), if they are not already available on Steam, will not become available there, in the near future?

I realize the same, but Slitherine sometimes release older games later (for example they just released Conflict of Heroes on Steam (a 2012 game).
I wish they release more of their older games on a faster rate.

We do add older games when we have time but its case by case on how complex it is to do to and how much of an audience there is for that game on steam, and how much time we have. There are no imminent plans to add more but they tend to happen when we have a lull in new releases.