Lo-Fi Games

I'm sorry if there was an announcement I missed, but I remember being able to play as 2 other skeleton subraces. I'm just curious as to why they are no longer playable

I don't remember that, but I really think it's boring that all the recruitable skeletons almost look exactly the same. They should have a wider range of graphics to distinguish them. In fact, I think everything but greenlander's has almost no uniqueness. Why can't Shek/Robots/Hives be green/red/blue on a slider?

I believe the option we once had to give our skeletons different heads was due to a developer error, they had mistakenly included the option which was never intended. Or so a google search tells me, I don't know how true that is.

You can mod it to pick any subrace, or find one on steam. my mod "reprogramming rods" does it in addition to adding some cool stuff

I found a mod called "Faces plus" or "Faces+" that among other things add back the skeleton subraces.
Highly recommended, and highly rated generally.