"More species macros especially growth-rate variability by sloth."
I replaced the species-specific asymmetrical EP tables with standardized "NARROW" and "BROAD" symetrical EP tables, and changed a few details, but it is substantially what sloth produced
I toyed around with another idea today: Minor species protecting their system with ships (handled as space monsters).
Some of the good specials generate Guardians to make the player invest something for their gain, so why not some useful minor species too.
Building spaceships is pretty much the concrete distinction between Imperial species (currently all playable) and minor species. If you want more empires, up the number when you start the game. Generally it's assumed that the minor species aren't spacefaring empires because they don't have the techs (or mindset) to make ships and leave their system.
However it is plausible that the Caretaker Precursors would protect some species with Guardian ships or even better-- shields.
already managed to give the Acimera an EffectsGroup that generates a guardian ship at turn 0. I want to expand that to a steady production of ships (like another ship every 40 turns).
However in the case of the Acimera it makes sense that they have ships, but aren't imperial. Since you've made it, we might as well put it in and see how it plays.