If I understood correctly, you’re suggesting that with the amount of worms, the growth of worms is also affected? For example, if it is between 5-9 without worms, from 50+ would be 6-10 and as such with each increment?
Yep! Basically the more worms you have, the faster their population grows either passively, or after the Worm (Big) scene. A passive increase in worms every night after they hit a certain number (Separate from the Worm (Big) event) would be really, really nice.
I’m not entirely sure regarding the passive gain of worms because of possible balance issues on combat, since more worms means more interruptions at the end of the turn, however the whole concept I think is good :).