How much changes in total with the new races you do ? Progress seems to be very fast, so I wonder if you even had the time to add sprites for each race, and nobles, and a somewhat different playstyle and custom buildings/reactions to them ?
Right now no races are 100% custom, they've all been preexisting races. Progress is fast because each update doesn't include much, and I don't really have much else to do. They're also usually not very playtested, but this will all change as soon as I put it in Beta. I do need to clean them all up in the next update.
They all change in their own ways. Like for example playing as Elves, you can't mine. So you have to adjust to building outdoor structures, and training a sizable military to be able to fend off a seige before any BUILDING_DESTROYER's come in and wreck the whole town. However playing as Antmen, you can do everything Dwarves can do, but there are multiple castes, so you have to do a lot of micromanagement on who does what. You also can have larger squads, so you can get militarily-creative with that.