I found the conduit, destroyed it and all the visible biters, nests, worms disappeared. When generating new chunks everything spawns as normal. Is this intended? I understood it to eliminate all.

Heya, apologies for the late response. It's not intended. Thanks for bringing this to my attention, my testing ended at destruction! lol I intend to work on this mod this week so will make a note of your "bug" :) Do you have any other feedback or thoughts on the concept? It is still quite early in development but I should be adding more content this week. Thanks!

Hey Potato, I've just uploaded a fix which should also "fix" your save game to not allow any new biters to spawn in new chunks. What you have already spawned, once destroyed, should be the end of it. I'm keen to hear any feedback you may have, distance of the conduit, it's "difficulty" etc. I'll hopefully have a few more mechanics completed by the end of the week that will make it a bit more interesting and exciting :) Thank you for letting me know about the issue, much appreciated!