I've tried it for abit and it seems to be working just fine tm so far, except for biomass.

what is needed for the biomass issue? a way to gather from the world? i could add to the willow or spawner remains when k2so is loaded.

The way it works is, biomass is supposed to be gathered in some amount from remains of biter nests. It would make (at least some) sense to add biomass in small amounts to the ore which is left by the nests exploding. Or may be a recipe to make biomass out of biter eggs.
But thing is, biomass is an earlygame resource (its required for mili science). So I don't know whats a good solution while keeping the biter design as is, is.

the pentapod eggs could spoil faster and into biomass, instead of turning into an enemy

well, maybe it makes more sense to spoil into enemies, but than when you kill pentapods, them to drop small amount of biomass?
Once you ahve collected some amount (~300 or so) it is possible to produce it - you need some quantity to build the building for it in k2 and than its pretty much coming out of air.

pentapods dont spawn until evo .5, but spoilage and pentapod eggs are gathered from the willow tree that was added. i will make an early recipe for it, using spoilage, wood and maybe a single pentapod egg

good stuff, thanks.

added to 0.2.8! i just made it available at start instead of building a tech unlock for it, cause lazy.