As far as my design document is concerned, other playable races will not be a thing. Part of Axu's draw is its limb and mutation system. Becoming something other than human is a task in itself. Wanna be a minotaur? Get some horns and hooves. Centaur? Fore and hind legs. Naga? Serpentine mutation that fuses your legs into a tail. I do plan on making modding powerful enough to provide the ability to create races in the future though.
I try to keep the world somewhat cohesive, so placing in mines (other than the one in game right now) or DCSS's runes just wouldn't fit. Anything more than a nod to existing IPs would only break any immersion.
Towns I do plan to expand though. Right now there are only single occupants for each house, shops, and hospitals. I want larger manors to exist, with cities surrounding it, roads between houses, actual guard towers (to place the already existing guards in) etc. I most likely won't go fully in depth with the generators though, since players realistically don't spend much time in any town for too long.
Crafting buildings was a feature initially, but I removed it since it didn't add anything to gameplay. Once I get the structure for a "base" which can be raided, visited, etc in place, this area of development will continue.
Thanks for the ideas! Hopefully I cleared up my design goals for Axu! :)